[Glitch] Add TypeScript support for `mastodon` alias and image imports

Port 5f709b1601 to glitch-soc

Signed-off-by: Claire <claire.github-309c@sitedethib.com>

app/javascript/flavours/glitch/types/image.d.ts

@@ -0,0 +1,34 @@
+declare module '*.avif' {
+  const path: string;
+  export default path;
+}
+
+declare module '*.gif' {
+  const path: string;
+  export default path;
+}
+
+declare module '*.jpg' {
+  const path: string;
+  export default path;
+}
+
+declare module '*.jpg' {
+  const path: string;
+  export default path;
+}
+
+declare module '*.png' {
+  const path: string;
+  export default path;
+}
+
+declare module '*.svg' {
+  const path: string;
+  export default path;
+}
+
+declare module '*.webp' {
+  const path: string;
+  export default path;
+}