Markdown links that reference / in design principles throw a Github 404

[ryancreatescopy]

Describe the bug
When trying to navigate via the links that refer to the root structure of ethereum.org rather than a full hyperlink in the design principles file, I'm sent to GitHub 404s instead of intended pages.

For example:
[Ethereum.org](http://ethereum.org) works
[across our site](/) doesn't work

To Reproduce
Steps to reproduce the behavior:

1. Go to https://github.com/ethereum/ethereum-org-website/blob/dev/design-principles.md
2. Scroll to the bottom
3. Follow "Across our site" or "style guide"
4. See 404 page

Note: this affects most links on the page but this is the clearest way of demoing the bug.

Expected behavior
The links should take you to pages on the ethereum.org site and not github 404s

Screenshots

Desktop (please complete the following information):

• iOS
• Chrome version 83.0.4103.61
• Brave version 1.8.96 Chromium: 81.0.4044.138

[ryancreatescopy]

We could replace them with hyperlinks: https://ethereum.org for example but this might not be the best option if we can work out a way to reference specific files in the structure like / or /style-guide

[samajammin]

Nice catch. I think I know why this is broken - when I originally added the About page, I added the Purpose & Design Principles docs as web pages as well (at ethereum.org/about/purpose/ & ethereum.org/about/principles, respectively).

Here's the PR: #918

We decided to take them down since they weren't fully fleshed out / intended as pages on our website but I'd like to re-add them. What do you think @ryancreatescopy @jjmstark? Perhaps this could be an initiative next sprint: revamping the project README, the purpose & design principles pages.

[github-actions]

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