fix(tree-sitter): remove slow html highlight patterns

Fixes Textualize#4152 by removing all
`((element (start_tag (tag_name) @_tag)` patterns from the `html.scm`
highlights query file.

These patterns will cause a segfault on relatively large documents
and even just one seems a massively expensive operation from some
quick testing.

All tests pass after removing these and I couldn't see they were
actually used anywhere in syntax highlighting, but please correct me
if I'm wrong!

src/textual/tree-sitter/highlights/html.scm

@@ -6,45 +6,6 @@
   (quoted_attribute_value) @string)
 (text) @text @spell
 
-((element (start_tag (tag_name) @_tag) (text) @text.title)
- (#eq? @_tag "title"))
-
-((element (start_tag (tag_name) @_tag) (text) @text.title.1)
- (#eq? @_tag "h1"))
-
-((element (start_tag (tag_name) @_tag) (text) @text.title.2)
- (#eq? @_tag "h2"))
-
-((element (start_tag (tag_name) @_tag) (text) @text.title.3)
- (#eq? @_tag "h3"))
-
-((element (start_tag (tag_name) @_tag) (text) @text.title.4)
- (#eq? @_tag "h4"))
-
-((element (start_tag (tag_name) @_tag) (text) @text.title.5)
- (#eq? @_tag "h5"))
-
-((element (start_tag (tag_name) @_tag) (text) @text.title.6)
- (#eq? @_tag "h6"))
-
-((element (start_tag (tag_name) @_tag) (text) @text.strong)
- (#any-of? @_tag "strong" "b"))
-
-((element (start_tag (tag_name) @_tag) (text) @text.emphasis)
- (#any-of? @_tag "em" "i"))
-
-((element (start_tag (tag_name) @_tag) (text) @text.strike)
- (#any-of? @_tag "s" "del"))
-
-((element (start_tag (tag_name) @_tag) (text) @text.underline)
- (#eq? @_tag "u"))
-
-((element (start_tag (tag_name) @_tag) (text) @text.literal)
- (#any-of? @_tag "code" "kbd"))
-
-((element (start_tag (tag_name) @_tag) (text) @text.uri)
- (#eq? @_tag "a"))
-
 ((attribute
    (attribute_name) @_attr
    (quoted_attribute_value (attribute_value) @text.uri))