chore: no free form issues, 'description'-s to 'placeholders'-s (#16)

## Description

There were some problems with the roll-out of the issue templates. This PR addresses them.

## Changes

- Disable `blank-issue-enabled`.
- Move all `description` types in the issue templates to `placeholder`.

### Design Decisions

- The `description` fields take up too much space.

## Checklist

- [x] Tests pass
- [x] Docs updated

Reviewed-on: #16
Co-authored-by: M.V. Hutz <git@maximhutz.me>
Co-committed-by: M.V. Hutz <git@maximhutz.me>

.gitea/ISSUE_TEMPLATE/FEATURE_REQUEST.yml

@@ -6,18 +6,10 @@ name: ✨ Feature Request
 about: Suggest an idea for this project
 title: "[FEATURE]: "
 body:
-  - type: markdown
-    attributes:
-      value: |
-        Thanks for taking the time to fill out this feature request! 🤗
-
-        Please make sure this feature request hasn't been already submitted by
-        someone by looking through other open/closed issues. 😃
   - type: dropdown
     attributes:
       multiple: false
-      label: Type of Feature
-      description: Select the type of feature request.
+      label: Feature Type
       options:
         - "✨ New Feature"
         - "📝 Documentation"
@@ -31,7 +23,7 @@ body:
     id: description
     attributes:
       label: Description
-      description: |
+      placeholder: |
         Give us a brief description of the feature or enhancement you would
         like!
     validations:
@@ -40,6 +32,6 @@ body:
     id: additional-information
     attributes:
       label: Additional Information
-      description: |
+      placeholder: |
         Give us some additional information on the feature request like proposed
         solutions, links, screenshots, etc.