Allow to use HTML blobs for option and result value tables

[felixfontein]

Instead of RST tables. But almost generates the same HTML as the RST tables do, so everything still looks like new and is responsive :)

The main downside of this is that R(...) does not work in those tables (i.e. as before).

The behavior can be turned off (similar to breadcrumbs).

See https://ansible.fontein.de/ for how the result looks.

[samccann]

Initial local testing with html blobs False (default) - (VM with 16G ram and 4 cpus):

• build time 1 hr (up from 30 minutes without this PR, and 16 minutes with current antsibull release)
• 805 build warnings (up from 400 ...something without this PR and 190 something with current antsibull release).

I haven't piped the warnings into a file to compare yet because this all brings my laptop to its knees and I can just sit and twiddle my thumbs while it's building now. I'm trying it next with the html blob tables true to see if that speeds things up enough locally.

[felixfontein]

@samccann did you build with or without HTML blobs? If building with them, it should be faster, not slower, and if building without them, there should be no difference to the current build (without this PR).

[samccann]

@felixfontein updated my comment to show it is with the default (html blobs false). Maybe there's gremlins in my VM. I'll try again in the am.

[samccann]

With html blob True - build time 20 minutes and 569 warnings (previously was less than this but I don't recall how much less... 490 maybe?)- same VM I used for prior comment.

[felixfontein]

@samccann thanks a lot for testing!