fix: version display, footer link, release name

- GetApplicationVersion: use AssemblyVersion instead of InformationalVersion
- Footer: @fristyxd -> @fristy, link to repo
- Release name: remove duplicate 'v' prefix (tag already has v)

.gitea/workflows/ci.yml

@@ -162,7 +162,7 @@ jobs:
           files: |
             artifacts/velopack/win-x64-stable/*.exe
             artifacts/velopack/win-x64-stable/*.zip
-          name: v${{ gitea.ref_name }}
+          name: ${{ gitea.ref_name }}
           body: |
             Release ${{ gitea.ref_name }}