feat(daffio): add packages overview page

[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
[x] 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?

There isn't a page that lists out all the available Daffodil packages and a short description of what each package does.

Part of: #2682
Dependent on #2716

What is the new behavior?

Package overview page that shows a brief summary about every Daffodil package.

Does this PR introduce a breaking change?

[ ] Yes
[x] No

Other information

[griest024]

Some of the packages (the ones that appear as dropdowns in sidebar) do not get the path transformed correctly since its missing in the root object.