chore: stop hiding repos/ in VS Code file explorer

Drop the files.exclude rule for repos/**. The directory is still
excluded from auto-imports and file watching, but no longer hidden
from the explorer.

.vscode/settings.json

@@ -1,9 +1,6 @@
 {
   "typescript.preferences.autoImportFileExcludePatterns": ["repos/**"],
   "javascript.preferences.autoImportFileExcludePatterns": ["repos/**"],
-  "files.exclude": {
-    "repos/**": true
-  },
   "files.watcherExclude": {
     "repos/**": true
   },