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So as to avoid any dependence on Java for normal users of the Gruntfile.

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Instead, use `bundleExec: true` for grunt-scss-lint.

Refs #17328

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- Simpler main nav on all pages
- Back to purple masthead on homepage instead of dark graphite
- Active link styles on the main nav
- Cleaned up sidebar nav
- New docs layout name
- Homepage copy edits
- Updated bright purple docs color

(also fix license banner generator bug)

X-Ref #16583

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Add a license header in theme instead.

Anchor.js 1.0.0 drops the need to use anchor.css, so we remove it
from the codebase and move any leftover styles over to docs.css.

Closes #16488 by merging it.

add modal my gawd