Strip comments from backend and frontend source

Remove Go doc comments, TS/Svelte scaffold comments and explanatory
notes left over from the initial scaffold, plus a few leftover Spanish
notes in the compose file, SQL scripts and env template. Also drops
frontend/src/lib/index.ts, which only held the SvelteKit placeholder
comment and was never imported.

frontend/src/app.d.ts

@@ -1,12 +1,5 @@
-// See https://svelte.dev/docs/kit/types#app.d.ts
-// for information about these interfaces
 declare global {
 	namespace App {
-		// interface Error {}
-		// interface Locals {}
-		// interface PageData {}
-		// interface PageState {}
-		// interface Platform {}
 	}
 }
 

frontend/src/lib/index.ts

@@ -1 +0,0 @@
-// place files you want to import through the `$lib` alias in this folder.