[fpc-pascal] Docs style update

[Michael Van Canneyt]

On Wed, 9 Sep 2026, Gene Buckle via fpc-pascal wrote:

> I like the doc updates.  Nicely done!
>
> Instead of having to pick one, would it be practical to give a CSS switcher 
> to allow folks to pick the layout they like best?

Excellent suggestion. Implemented, see this version:

https://www.freepascal.org/~michael/docs-demo/docs/switch/

Requires some javascript, but someone who has javascript disabled will
simply have the default (compact).

The chm will not have the switch.

Michael.