Optimize page title of rule docs

[vitorbal]

I would like to modify the page title of the rule docs so that the name of the rule is the first thing in it.
This is a small optimization, but it's very convenient when the browser tab headers are very small, i.e see screenshots in eslint/archive-website#268.

Here's how it would look like for the template-curly-spacing rule, for example:

I need to modify the frontmatter that is generated for the rule docs in the gensite task, hence why I'm opening an issue here as well, besides the one in eslint/eslint.github.io.

[ilyavolodin]

Sounds good to me.

[kaicataldo]

Awesome!