## Context

- Mention support for EEx templates
- Rearranges a few sections (HEEx, `elixir-ls` workspace configuration)
- Corrects naming of HEEx and mention that language server
configurations also need to be applied to it (and EEx)
- Removes unnecessary instructions for how to install `elixir-ls` - the
extension has been able to do this on its own for a long time;
additionally, these instructions were very macOS-specific
- Demonstrates how to pass initialization options to `next-ls` and
workspace configuration options to `expert`
- Rewords the formatting with Mix section - all language servers already
use Mix for code formatting, so these instructions are only useful if
you work _without_ a language server
- Adjust Tailwind LSP configuration instructions

## How to Review

Check for typos and that the wording/structure of the new/reworded
sections is also good.

Release Notes:

- N/A

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Co-authored-by: Finn Evers <finn.evers@outlook.de>