* Comments without terminating newlines in nonstrict mode
Fix#1506 by allowing single-line comments (`%` without terminating newline)
in nonstrict mode. `Lexer` and `MacroExpander` now store the `Settings`
object, so the `Lexer` can complain about missing newline according to the
`strict` setting. I filtered this out from the snapshot tests with a slightly
different `replacer`.
* Reimplement \href like \verb, add \url
Major restructuring to lex URL arguments differently, e.g. to support
`\href%{hello}` and `\href{http://foo.com/#test%}{hello}`. The new URL
parsing code is simpler, but involves a special case in `parseSymbol`
like `\verb`.
Also add support for `\url` while we're here.
* Cleanup
* Fix flow errors and improve error messages
* Add \url to documentation
* Improve doc formatting
* website/docs: initial commit
* Change secondaryColor
* Fix index.css not being copied and included on global stylesheet
* Fix stylesheet link
[skip ci]
* Change documentation link to API(Usage)
[skip ci]
* Add `Libraries` in usage
[skip ci]
* Remove documentation from `README.md` and add link to the site
[skip ci]
* Use KaTeX in the parent directory to build Markdown
[skip ci]
* Revise function support page. Avoid error msgs.
* General edit to function support page
