The HTML highlights queries implemented by nvim-treesitter are extremely

slow, and don't seem to actually buy us anything in the resulting

output. This change adds custom queries for HTML which are based on the

upstream queries from the tree-sitter-html implementation, but with

improved injections for inline CSS and JS within tags.

Ran unit tests.
Checked syntax highlighting of HTML and verified that everything

  looked good, including injected CSS and JS both in <script> and

<style> tags, as well as on*="" andstyle=""` attributes.
Profiled syntax highlighting of HTML and verified that the performance

  of these queries was better (by 100x) than the nvim-treesitter HTML

  queries.