feat(declib): initial mastodon bot experiment

No default.nix yet, just for development.

Change-Id: Ib8bd0057d697fecd083d5961e635c770b7638e08
Reviewed-on: https://cl.tvl.fyi/c/depot/+/10803
Reviewed-by: Profpatsch <mail@profpatsch.de>
Tested-by: BuildkiteCI

users/Profpatsch/.vscode/settings.json

@@ -8,7 +8,18 @@
         }
     ],
     "sqltools.useNodeRuntime": true,
-    "[haskell]": {
-        "editor.formatOnSave": true
-    }
+    "editor.formatOnSave": true,
+    "[typescript]": {
+        "editor.defaultFormatter": "esbenp.prettier-vscode"
+    },
+    "[javascript]": {
+        "editor.defaultFormatter": "esbenp.prettier-vscode"
+    },
+    "[json]": {
+        "editor.defaultFormatter": "esbenp.prettier-vscode"
+    },
+    "purescript.codegenTargets": [
+        "corefn"
+    ],
+    "purescript.foreignExt": "nix"
 }