Fix malformed source code link in the example app

[maragubot]

What was found

The example app's home page rendered a link with a malformed scheme separator:

internal/examples/app/html/home.go:14 had href="https:/github.com/maragudk/gomponents/tree/main/internal/examples/app" — one slash after https: instead of two.

The README points users at this example app as "a more complete example", so it's a user-facing link. Browsers normalise https:/host back to https://host, which is why it went unnoticed, but net/url.Parse reads it as an empty host with the whole thing as a path, so any stricter consumer follows it nowhere.

The typo dates back to the v1 release commit, which rewrote the URL from maragu.dev/gomponents/... to the GitHub form and dropped a slash in the process.

What was fixed

Added the missing slash. One character, one line. The target https://github.com/maragudk/gomponents/tree/main/internal/examples/app resolves, and the owner, repo, and main branch in it are all current.

A repo-wide scan for the same bug class turns up no other occurrences.

Review notes

Clean review — no concerns raised.

Two pre-existing observations came up that are out of scope here and left for a future pass:

• CI never builds the example app. .github/workflows/ci.yml runs go build ./... and go test ./... at the repo root, but internal/examples/app is a separate module (module app), so the root ./... never reaches it. That's why a broken link could sit there indefinitely.
• internal/examples/app/go.mod still requires maragu.dev/gomponents v1.0.0-beta1. Harmless today because go.work replaces it with the local checkout, but stale.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 100.00%. Comparing base (76f04c0) to head (433d302).

Additional details and impacted files

@@            Coverage Diff            @@
##              main      #336   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files            6         6           
  Lines          639       639           
=========================================
  Hits           639       639           

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