[core] Fix Metadata for Flatpak (#184)

The Linux version of the app is distributed via Flatpak, this commit
fixes some issues shown in the validation on Flathub. This includes the
summary and branding color and the app icon which should be square
instead of round.

app/linux/flatpak/app.feeddeck.feeddeck.metainfo.xml

@@ -4,7 +4,7 @@
   <metadata_license>CC0-1.0</metadata_license>
   <project_license>MIT</project_license>
   <name>FeedDeck</name>
-  <summary>Follow RSS and Social Media Feeds</summary>
+  <summary>Feed reader</summary>
   <developer_name>Rico Berger</developer_name>
 
   <url type="homepage">https://feeddeck.app</url>
@@ -19,6 +19,11 @@
     <content_attribute id="money-purchasing">intense</content_attribute>
   </content_rating>
 
+  <branding>
+    <color type="primary" scheme_preference="light">#1f2229</color>
+    <color type="primary" scheme_preference="dark">#1f2229</color>
+  </branding>
+
   <description>
     <p>
       FeedDeck is an open source RSS and social media feed reader, inspired by TweetDeck. FeedDeck allows you to follow your favorite feeds in one place on all platforms. FeedDeck is written in Flutter and uses Supabase and Deno as it's backend.

app/linux/flatpak/app.feeddeck.feeddeck.svg

@@ -2,8 +2,8 @@
 <!DOCTYPE svg PUBLIC "-//W3C//DTD SVG 1.1//EN" "http://www.w3.org/Graphics/SVG/1.1/DTD/svg11.dtd">
 <svg width="100%" height="100%" viewBox="0 0 4096 4096" version="1.1" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" xml:space="preserve" xmlns:serif="http://www.serif.com/" style="fill-rule:evenodd;clip-rule:evenodd;stroke-linejoin:round;stroke-miterlimit:2;">
     <g id="icon-linux">
-        <g id="bg" transform="matrix(1.77687,0,0,1.77687,-1011.62,-1480.98)">
-            <circle cx="1721.91" cy="1986.06" r="1152.59" style="fill:rgb(73,211,180);"/>
+        <g id="bg" transform="matrix(2.30943,0,0,2.25704,-1582.56,-1114.43)">
+            <path d="M2339.78,621.098C2339.78,619.166 2338.24,617.598 2336.35,617.598L809.714,617.598C807.826,617.598 806.293,619.166 806.293,621.098L806.293,2183.17C806.293,2185.11 807.826,2186.67 809.714,2186.67L2336.35,2186.67C2338.24,2186.67 2339.78,2185.11 2339.78,2183.17L2339.78,621.098Z" style="fill:rgb(73,211,180);"/>
         </g>
         <g id="fg" transform="matrix(13.5357,0,0,13.0255,-2722.19,-2672.07)">
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app/templates/app-icon/linux.svg

@@ -2,8 +2,8 @@
 <!DOCTYPE svg PUBLIC "-//W3C//DTD SVG 1.1//EN" "http://www.w3.org/Graphics/SVG/1.1/DTD/svg11.dtd">
 <svg width="100%" height="100%" viewBox="0 0 4096 4096" version="1.1" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" xml:space="preserve" xmlns:serif="http://www.serif.com/" style="fill-rule:evenodd;clip-rule:evenodd;stroke-linejoin:round;stroke-miterlimit:2;">
     <g id="icon-linux">
-        <g id="bg" transform="matrix(1.77687,0,0,1.77687,-1011.62,-1480.98)">
-            <circle cx="1721.91" cy="1986.06" r="1152.59" style="fill:rgb(73,211,180);"/>
+        <g id="bg" transform="matrix(2.30943,0,0,2.25704,-1582.56,-1114.43)">
+            <path d="M2339.78,621.098C2339.78,619.166 2338.24,617.598 2336.35,617.598L809.714,617.598C807.826,617.598 806.293,619.166 806.293,621.098L806.293,2183.17C806.293,2185.11 807.826,2186.67 809.714,2186.67L2336.35,2186.67C2338.24,2186.67 2339.78,2185.11 2339.78,2183.17L2339.78,621.098Z" style="fill:rgb(73,211,180);"/>
         </g>
         <g id="fg" transform="matrix(13.5357,0,0,13.0255,-2722.19,-2672.07)">
             <path d="M443.567,272.226C438.383,276.258 434.063,278.274 430.607,278.274C423.695,278.274 416.783,274.146 409.871,265.89L369.263,293.826C362.927,298.434 359.759,304.194 359.759,311.106L359.759,429.186L359.471,429.474C359.471,432.354 358.559,435.234 356.735,438.114C354.911,440.994 352.943,442.434 350.831,442.434L350.255,442.434L350.255,439.554L347.951,442.722C345.071,442.53 337.583,439.17 325.487,432.642L325.487,432.93C313.199,425.826 302.927,422.274 294.671,422.274C286.223,422.274 278.447,425.442 271.343,431.778C268.079,434.658 265.439,438.162 263.423,442.29C261.407,446.418 260.111,451.266 259.535,456.834C263.759,451.842 268.943,449.058 275.087,448.482C276.239,448.482 277.007,448.386 277.391,448.194L277.967,448.194C282.191,448.194 290.351,450.594 302.447,455.394C308.207,457.698 315.215,458.85 323.471,458.85C334.991,458.85 347.471,455.778 360.911,449.634C376.271,442.53 385.871,434.082 389.711,424.29C390.287,422.946 390.575,421.602 390.575,420.258L390.863,370.722L410.735,370.722L410.735,431.778L421.391,431.778L421.391,301.314C425.231,300.354 428.687,298.482 431.759,295.698C434.831,292.914 437.807,289.314 440.687,284.898C443.183,281.058 444.431,278.274 444.431,276.546L444.719,276.258C444.719,275.49 444.911,274.53 445.295,273.378L443.567,272.226ZM356.015,297.282C350.447,298.242 345.503,299.874 341.183,302.178C336.863,304.482 332.975,307.266 329.519,310.53C321.647,317.634 317.711,326.562 317.711,337.314L317.711,338.754L317.999,339.042L317.999,340.194C317.231,340.194 316.655,340.098 316.271,339.906L313.679,339.906C298.127,339.906 290.351,347.874 290.351,363.81C290.351,368.418 291.695,372.498 294.383,376.05C297.071,379.602 300.719,381.378 305.327,381.378L305.327,379.362L305.039,379.074L305.039,377.922L304.751,377.634C304.751,373.218 308.015,371.01 314.543,371.01L316.559,371.01L317.135,371.298L318.287,371.298L318.287,413.634C318.095,414.018 317.951,414.498 317.855,415.074C317.759,415.65 317.615,416.13 317.423,416.514C317.039,417.282 316.703,418.194 316.415,419.25C316.127,420.306 315.887,421.026 315.695,421.41L318.575,421.41L319.151,421.122L319.727,421.122L320.015,420.834C322.703,420.834 326.351,419.202 330.959,415.938C344.399,407.106 351.119,396.93 351.119,385.41L351.119,310.818C351.119,308.706 351.647,306.45 352.703,304.05C353.759,301.65 355.055,300.162 356.591,299.586L356.015,297.282ZM375.023,266.754C370.415,270.978 365.231,273.09 359.471,273.09C351.407,273.09 345.647,272.226 342.191,270.498L341.615,270.498L341.327,270.21C338.063,269.634 335.375,269.106 333.263,268.626C331.151,268.146 329.615,267.81 328.655,267.618L325.775,267.618C320.207,267.042 317.231,266.562 316.847,266.178L314.831,267.042C298.319,267.426 286.799,273.186 280.271,284.322C277.391,289.314 275.951,293.73 275.951,297.57L275.951,300.162C282.671,295.938 286.991,293.826 288.911,293.826L290.063,293.826L290.351,293.538C294.767,293.538 302.063,294.594 312.239,296.706C321.839,298.818 329.039,299.874 333.839,299.874L334.127,300.162L335.279,300.162C344.687,300.162 353.615,297.09 362.063,290.946C371.087,284.418 376.079,276.642 377.039,267.618L375.023,266.754ZM409.583,301.89C409.775,301.89 409.919,301.938 410.015,302.034C410.111,302.13 410.351,302.082 410.735,301.89L410.735,340.482L390.863,340.482L390.863,294.402C397.967,299.394 404.207,301.89 409.583,301.89Z" style="fill:rgb(31,34,41);fill-rule:nonzero;"/>