Add gitignore for /docs to include misc/release articles (#436)

docs/.gitignore

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+!release

docs/misc/release/create-new-release.md

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+---
+layout: default
+title: Create a new release
+parent: Release
+grand_parent: Miscellaneous
+nav_order: 1
+---
+
+# Release Preparation Checklist
+
+Follow the steps in the checklist below to prepare a new release.
+
+- [ ] Update ./src/Shared/AliasVault.Shared.Core/AppInfo.cs and update major/minor/patch to the new version. This version will be shown in the client and admin app footer.
+- [ ] Update ./install.sh `@version` in header if the install script has changed. This allows the install script to self-update when running ./install.sh update command on default installations.
+- [ ] Update README screenshots if applicable
+- [ ] Update README current/upcoming features
+
+Optional steps:
+- [ ] Update /docs instructions if any changes have been made to the setup process

docs/misc/release/index.md

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+---
+layout: default
+title: Release
+parent: Miscellaneous
+nav_order: 1
+---