chore: remove feature request issue template

Feature requests should be suggested via the forum, not via GitHub
issues. The config.yml already directs users to the forum for this.

.github/ISSUE_TEMPLATE/feature.yml

@@ -1,35 +0,0 @@
-name: Feature Request
-description: Found something you weren't expecting? Report it here!
-type: Feature
-body:
-  - type: markdown
-    attributes:
-      value: |
-        NOTE: If your issue is a security concern, please send an email to security@vikunja.io instead of opening a public issue. [More information about our security policy](https://vikunja.io/contact/#security).
-  - type: markdown
-    attributes:
-      value: |
-        Please fill out this issue template to request a new feature.
-
-        1. If you want to report a bug, please use the Bug template.
-        2. Please ask questions or configuration/deploy problems on our [Matrix Room](https://matrix.to/#/#vikunja:matrix.org) or forum (https://community.vikunja.io).
-        3. Make sure you are using the latest release and take a moment to check that your feature hasn't been requested before.
-        4. Please include all relevant information in the feature request to allow users to discuss this fully.
-  - type: checkboxes
-    id: searched
-    attributes:
-      label: Pre-submission checklist
-      options:
-        - label: I have searched for existing open or closed issue reports with the same feature request.
-          required: true
-  - type: textarea
-    id: description
-    attributes:
-      label: Description
-      description: |
-        Please provide a description of the feature you are looking for.
-  - type: textarea
-    id: alternatives
-    attributes:
-      label: Which alternatives did you consider using instead?
-