Add `cite` attribute

[yardenshoham]

It can appear in a <blockquote>.

• Closes https://github.com/maragudk/gomponents/issues/189

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 100.00%. Comparing base (033f6ac) to head (f3a202e). Report is 1 commits behind head on main.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #192 +/- ## ========================================= Coverage 100.00% 100.00% ========================================= Files 9 9 Lines 534 538 +4 ========================================= + Hits 534 538 +4 ```

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[markuswustenberg]

Thanks for this @yardenshoham ! 😊