RFR: Added more labels

[Jesper Wilhelmsson]

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

More labels will be added later. I didn't want to add more new as I changed the HTML in this change, which makes it harder to see the new stuff in the diff.

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