readme corrections and more details

946fa8da9b6db61978f69674ae7c847f39763944

Tucker McKnight <tmcknight@instructure.com> | Tue Mar 03 2026

readme corrections and more details
README.md:3
Before
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- [index-slim.html](index-slim/index.html)
- [index2.html](demo/index2.html)
- [main-slim.html](demo/main-slim.html)
After
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  - rough draft of the default template for repoviewer. I posted a link to this mockup for feedback here: https://feddit.online/post/1159392
- [index-slim.html](demo/index-slim.html)
  - A more compact version of that rough draft, from when I thought I might want the header on every page
  - A slightly different color scheme
- [design-board.html](demo/design-board.html)
  - Different idea for the default template, which eventually became what I went with