Missed a few includes that are referred to by the navbar. (#7093)

* Omitting the named anchor from header Download link.

Signed-off-by: Nathan Boot <[email protected]>

* Updates navbar yml.

* Navbar sass and html includes required for navbar.

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Signed-off-by: Nathan Boot <[email protected]>
Co-authored-by: Heather Halter <[email protected]>
(cherry picked from commit 1d10e1c)
Signed-off-by: github-actions[bot] <github-actions[bot]@users.noreply.github.com>