Add sidebar nav to jquery.com pages

We have the pages directly on jquery.com. See also https://jquery.com/wp-sitemap-posts-page-1.xml.

The "License", "Team", "Support", and "History" pages were recently imported from jquery.org per https://github.com/jquery/jquery.org/issues/139.

While "Support" was added to the main nav (as "Version Support"), several of the above are hard to discover. Requiring either browsing the Top nav, or finding it indirectly via other pages, or via typeahead search suggestions.

I suggest we enable the sidebar on these pages. This is similar to what we do on other jQuery sites (api.jquery.com, blog.jquery.com, and learn.jquery.com). And for jQuery UI, it was always done on the main site as well (e.g. https://jqueryui.com/about/).

For jQuery UI, while the sidebar has always been enabled there, including on these kinds of meta pages, those meta pages were not themselves linked from that same sidebar. I fixed that in https://github.com/jquery/jqueryui.com/pull/229 a few months ago.

Once we have a solution for navigating to these pages (whether the proposed sidebar, or something else), I'd be interested in importing a "Brand Guidelines" page of sorts as well, after which we could potentially phase out https://brand.jquery.org/. I did this for QUnit at https://qunitjs.com/brand/.

Thoughts?

Preview

This is an example of what it might look like:

Page	Screenshot
API (unchanged)
Blog (unchanged)
Support (after)
Support (before)
Team (after)
Team (before)

Note that the default page layout is already mobile-friendly. It renders similar to before on mobile when above the fold (except left-aligned instead of centered, and with a bit more room for content on mobile). The sidebar is an appendix in mobile.

Before	After