Update to new documentation layout [WD-7866]

[aaryanporwal]

Done

• Updates docs to use new layout from Vanilla 4.5.
• Created partials for footer and navigation.
• Used example template and docs provided in discourse module repo: https://github.com/canonical/canonicalwebteam.discourse/blob/main/examples/README.md

QA

• Check out this feature branch
• Run the site using the command dotrun
• View the site locally in your web browser at: http://0.0.0.0:8043/
• Run through the following QA steps
• [List additional steps to QA the new features or prove the bug has been resolved]

Issue / Card

Fixes #

Screenshots

[webteam-app]

Demo starting at https://anbox-cloud-io-323.demos.haus

[edlerd]

One small suggestion to improve the footer.

Another suggestion to make search results consistent with the docs pages.

[edlerd]

QA looks good now, thanks :)

The scss linter has some errors, can you have a look at it?

[aaryanporwal]

QA looks good now, thanks :)

The scss linter has some errors, can you have a look at it?

Just added a new commit to fix it, please take a look :)

[edlerd]

Everything LGTM, thanks for the changes and also including the new logo. I think the new logo looks fine.
Tiny nitpick below, then ready for merge from my side.

[aaryanporwal]

Let me squash and make the commit history look better