Include minify_css and minify_js in the public API

[Jayman2000]

I’m currently creating a Web site for myself, and I have a build script written in Python. The build script uses minify-html. Now that I’ve added CSS to my project, I want to minify it as well. Here’s the problems that I’m running into:

• There’s a Python wrapper for esbuild, but it’s “[WIP]” and “highly experimental” and it appears to be abandoned (its homepage 404s).
• Using a separate Python package would be inefficient. There would be two copies of esbuild, one for minify-html and another for the other package.

Here’s why I think it makes sense to include minify_css and minify_js in the public API:

• Most people probably want to use the same minifier for inline CSS/JS and CSS/JS files. If minify-html switches away from eslint, then most people would probably want to switch with it. Exposing these functions makes staying consistent easy.
• In some cases (like with Python packages), it results in one less copy of eslint.
• The functions need to exist anyway, so it (hopefully) wouldn’t be too much of a burden to maintain.

[wilsonzlin]

See the comment on #67.