Mkdocs styles and home refactor + navigation menu nav items fixes

[gabo1208]

Fixes #3561, #3548

Proposed Changes

• Better organization of the css (take them out of the templates html
• Removed all home content from the navs section to the content section
  this re-enables some theme features like the back to top button, fixed header (with shadow)
  and scrolling events detection on the landing (home) page

You can view the results of this PR here

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[julz]

looks awesome - thanks! Think you'll need to rebase on #3558 though to pick up the little extra css there for the blog and community links.

(btw having stuff under the header instead of content was actually intentional to try to make the header feel like one larger continuous block on the homepage, but with the new animated gradient we already moved away from that anyway so this seems reasonable to me; either way the reorg of the css is nice)

[julz]

.. hah, I just realised #3558 didnt actually merge yet, so I guess whichever lands last will have to rebase! :D

[gabo1208]

Yeeeh XD was waiting for the merge @julz but feel free to merge this first :p

[julz]

was it this PR that made the top block bigger or was it the gradient PR? Im not sure I personally like the header being quite this big (Im not a designer, tho!):

[julz]

.. looks like it was gradient that changed that 🤷 anyway no big deal

I think let's hold off on this until #3558 lands if only so you can fix up my crappy css to be in the right place etc, if that's ok? :D

[gabo1208]

Was the gradient PR, i just reorganized those styles to the separated files and integrated them with the new home html layout
But yeah! The banner looks kinda cool and more interesting now

[julz]

(yeah the gradient is sick!)

[gabo1208]

Sure! Lets wait for #3558 then 👍🏼

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[julz]

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[knative-prow-robot]

@gabo1208: PR needs rebase.

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[knative-prow-robot]

@gabo1208: The following tests failed, say /retest to rerun all failed tests:

Test name	Commit	Details	Rerun command
pull-knative-docs-go-coverage	016e3a9	link	/test pull-knative-docs-go-coverage
pull-knative-docs-integration-tests	016e3a9	link	/test pull-knative-docs-integration-tests
pull-knative-docs-build-tests	016e3a9	link	/test pull-knative-docs-build-tests
pull-knative-docs-unit-tests	016e3a9	link	/test pull-knative-docs-unit-tests

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[gabo1208]

Too much troubles with the rebase