Vue.js defined a bunch of symbols in it's scanner that collided with
those defined in HTML Tree-sitter grammar. I simply removed them as they
were meant for consumption by the external parties interested in HTML
parser with Vue support - since we handle that ourselves this is not
really necessary to preserve anymore. cc was firing up a bunch of
warnings about unused symbols when I've marked those functions as
`static`, so yeah.
Release Notes:

- Fixed HTML highlighting breaking in presence of <!-- --> comments
(fixes zed-industries/community#2166).