Help sidebar: Move docs to docs repo & Integrate them into the UI

[florian-h05]

Follow-up for #2088.
Depends on openhab/openhab-docs#2199.

Also add the help sidebar button to the settings and list pages where it is missing.

[relativeci]

Job #1371: Bundle Size — 15.83MiB (-0.09%).

0340a06(current) vs f493e97 main#1370(baseline)

Warning

Bundle contains 16 duplicate packages – View duplicate packages

Bundle metrics   3 changes 1 improvement

	Current Job #1371	Baseline Job #1370
Initial JS	1.89MiB(-0.7%)	1.9MiB
Initial CSS	609.81KiB	609.81KiB
Cache Invalidation	93.88%	93.98%
Chunks	217	217
Assets	683	683
Modules	3012(-0.79%)	3036
Duplicate Modules	170	170
Duplicate Code	1.6%	1.6%
Packages	152	152
Duplicate Packages	16	16

Bundle size by type   2 changes 2 improvements

	Current Job #1371	Baseline Job #1370
JS	9.3MiB (-0.13%)	9.31MiB
Other	4.75MiB (-0.06%)	4.75MiB
CSS	861.35KiB	861.35KiB
Fonts	526.1KiB	526.1KiB
Media	295.6KiB	295.6KiB
IMG	140.74KiB	140.74KiB
HTML	1.23KiB	1.23KiB

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[stefan-hoehn]

I think with the latest change you pushed, which we discussed offline, covering the non-availability of the internet, it is looking pretty good. I also looked through the code and I don't see any obvious issue. So, I think we are good to go.

This PR, based on the related restructuring of the docs sidebar, is a great step forward for context sensitive in the UI and a good integration into the online docs.
Thanks, Florian (not only for the implementation but also for the contribution of the related docs)!

[stefan-hoehn]

The code looks good to me. I don't see any obvious issue.