Swedish adaptation: Instegscertifikat and HAREC

- Editions replaced by INSTEG, HAREC and UPPGRADERING (Instegscertifikat -> HAREC)
- Question pool optional; simulator, homework tool and solutions switch off without one
- All UI strings, templates, renderers and project JS localised to sv-SE
  (decimal comma, Swedish non-breaking-space rules, Å/Ä/Ö in Morse table)
- DARC branding, membership CTA and German links removed; attribution footer added
- Page names centralised in src/pages.py
- README and docs rewritten in Swedish

Co-Authored-By: Claude Sonnet 5.5 <[email protected]>

main.py

@@ -11,14 +11,10 @@ app = typer.Typer()
 
 @app.command()
 def main(
-    edition: Annotated[list[Edition], typer.Option(help="Edition to build, can be specified multiple times.")] = [  # noqa: B006 -- default value is required for typer
-        Edition.swl,
-        Edition.n,
-        Edition.e,
-        Edition.a,
-        Edition.ne,
-        Edition.ea,
-        Edition.nea,
+    edition: Annotated[list[Edition], typer.Option(help="Course to build, can be specified multiple times.")] = [  # noqa: B006 -- default value is required for typer
+        Edition.instegs,
+        Edition.harec,
+        Edition.uppgradering,
     ],
     input: Annotated[str | None, typer.Option("--input", "-i", help="Content source directory.")] = None,
     output: Annotated[str | None, typer.Option("--output", "-o", help="Destination directory to build to.")] = None,