RFR: Added more labels

[Iris Clark]

On Fri, 23 Sep 2022 13:27:16 GMT, Jesper Wilhelmsson <jwilhelm at openjdk.org> wrote:

> * Added the labels: compilercontrol, conformance, footprint, jvmci
> * Clarified where some features belongs
> * Changed the html code slightly to make it easier to see the labels when scrolling up and down the file

Marked as reviewed by iris (Reviewer).

-------------

PR: https://git.openjdk.org/guide/pull/93