chore(docs): update filters for tokens

[evwilkin]

This PR:

• Updates the filters to match the token layers (Semantic, Base, Palette, Charts) and defaults to Semantic view.
• Fixes bug where multiple layers of tokens show in one view. Visible tokens now only reflect the selected layer.
• Adds expandable rows for all tokens that evaluate to a color (currently some tokens have color values that show a preview but have no way to view the value).
• Adds results count when a search term is entered.

[evwilkin]

Preview link: https://pf-tokens-pr86.surge.sh/tokens/all-patternfly-tokens

[srambach]

I find this a little confusing since palette and chart are both tabs and in the dropdown.
I think I also got into an incorrect state - ?

[evwilkin]

Thanks @srambach I see that too. Will dive back in to address this feedback 👍

[bekah-stephens]

looks good! the only thing I noticed is that we don't have an empty state when the search/filter results are 0. not a huge deal, but the blank space with the floating table headers is a bit odd.

[evwilkin]

@bekah-stephens updated w/empty state 🥇 and fixed styling of the "0" count shown in your screenshot above

[srambach]

LGTM! 🌮