feat(daffio): add design docs route

[griest024]

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?

Part of: #2684

What is the new behavior?

Does this PR introduce a breaking change?

[ ] Yes
[ ] No

Other information

#3112 is an issue but shouldn't block this PR

[xelaint]

Top nav should stay the same as the primary /docs nav, except Design needs to be added as a nav item, which navigates to docs/design

• Examples is not going to be path that we'll be using since all examples will be housed within the overview tab.
• Packages should be changed to Components
• docs/design should be a custom page not rendered by a README. It's going to look something like this (I can do the UI for it, just needed the route set up)

• The API reference page for each component is going to be displayed in the form of a tab within the component page.

[griest024]

@xelaint I've reworked the design docs structure to hopefully match your requirements. Note there are two issues that should be handled in future PRs and not block this one:

• The order of items in the sidebar does not match the design. We need a good pattern for hardcoding tree order and sorting.
• The docs don't have overview/API tabs. In a future PR, add a design for this and I will wire it up.

[xelaint]

@xelaint I've reworked the design docs structure to hopefully match your requirements. Note there are two issues that should be handled in future PRs and not block this one:

• The order of items in the sidebar does not match the design. We need a good pattern for hardcoding tree order and sorting.
• The docs don't have overview/API tabs. In a future PR, add a design for this and I will wire it up.

issues for these have been added, #3123 and #3124