Format JSON and YAML using Prettier (#17823)

* Format JSON and YAML using Prettier

* Add prettier to devDep

.devcontainer/docker-compose.yml

@@ -9,9 +9,9 @@ services:
         # Update 'VARIANT' to pick a version of Ruby: 3, 3.1, 3.0, 2, 2.7, 2.6
         # Append -bullseye or -buster to pin to an OS version.
         # Use -bullseye variants on local arm64/Apple Silicon.
-        VARIANT: "3.0-bullseye"
+        VARIANT: '3.0-bullseye'
         # Optional Node.js version to install
-        NODE_VERSION: "14"
+        NODE_VERSION: '14'
     volumes:
       - ..:/workspaces/mastodon:cached
     environment:
@@ -34,7 +34,6 @@ services:
       - internal_network
     user: vscode
 
-
   db:
     image: postgres:14-alpine
     restart: unless-stopped