feat(daffio): update marketing and docs sidebars, add packages sidebar

[xelaint]

PR Checklist

Please check if your PR fulfills the following requirements:

• The commit message follows our guidelines: https://github.com/graycoreio/daffodil/blob/develop/CONTRIBUTING.md#commit
• Tests for the changes have been added (for bug fixes / features)
• Docs have been added / updated (for bug fixes / features)

PR Type

What kind of change does this PR introduce?

[ ] Bugfix
[ ] Feature
[ ] Code style update (formatting, local variables)
[ ] Refactoring (no functional changes, no api changes)
[ ] Build related changes
[ ] CI related changes
[ ] Documentation content changes
[ ] Other... Please describe:

What is the current behavior?

Part of: #2682

What is the new behavior?

Does this PR introduce a breaking change?

[ ] Yes
[ ] No

Other information

[xelaint]

@griest024 this PR covers a few different things, but they're kind of intertwined and hard to split up. Lmk if the commits are confusing. I have a few questions and requests regarding named views and dynamic sidebar:

1. Header and footer is not always used. How to hide the containers if they’re not used?
2. Some sidebars may only have header/footers when it’s in a mobile view or if sidebar goes from side-fixed to over/under. How can I change visibility depending on these conditions?
3. Sidebar content should switch depending on which activator is pressed/clicked on. The top level hamburger menu opens the docs sidebar, but the button within the doc viewer that says packages menu should open the packages list sidebar.

[xelaint]

Closed in favor of #2725