Documents how to configure the Tailwind CSS language server for Gleam,
and updates the link on the Tailwind landing page to anchor at the new
section so it matches the pattern used for Astro, ERB, HEEx, HTML,
TypeScript, JavaScript, PHP, Svelte, and Vue.

The config follows what was documented in #43968 when Gleam was added to
`tailwind.rs`.

Refs: #43969

Release Notes:

- N/A

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Co-authored-by: Kaedin Hano-Hollis <180361443+kaedinhanohano@users.noreply.github.com>
Co-authored-by: Kunall Banerjee <hey@kimchiii.space>