Add a :toggle option for tree-sitter font-lock

Add a :toggle option for tree-sitter font-lock

* admin/notes/tree-sitter/html-manual/Parser_002dbased-Font-Lock.html:
Update html manual.
* admin/notes/tree-sitter/html-manual/build-manual.sh: Fix manual
path.
* admin/notes/tree-sitter/starter-guide: Mention :toggle.
* doc/lispref/modes.texi: Mention :toggle.
* lisp/treesit.el (treesit-font-lock-settings): Update docstring.
(treesit-font-lock-rules): Handle :toggle.  Also change
some wrong-type-argument signal to treesit-font-lock-error which is
easier to understand.
(treesit-font-lock-fontify-region): Handle :toggle.