Correct "Edit this page" links

[mjherzog]

On all of the PURL Specification pages and on the VERS Specification / Documentation page there is an "Edit this page" link at the bottom of each page - they all return a "Not found" message. For the PURL Specification / PURL Types page the URL for the edit link is: https://github.com/package-url/docs/purl-spec/purl-spec-purl-types.md so I understand the error message.

We need to either correct the URLs to point to the source markdown file in the purl-spec repo or at least temporarily remove the "Edit this page" links. I am guessing that getting the URLs to function accurately may be difficult while the website is in flux, so removing the links would be fine for now, but we will want to get this working like it does for https://relay.dev/docs/ at some point.

For the PURL Specification / Documentation page or other pages composed of multiple markdown files it would be a bonus to be show an Edit link for each markdown file so that the reader can easily see where the text originates from. This might require breaking the long Documentation page into a set of pages that map to the markdown files - we do not want to send the reader to the generated purl-specification.md file.

We will want consistent behavior for this on all pages as we replace the lorem ipsum placeholders with real text.

[johnmhoran]

@mjherzog I've addressed this in #21.

[mjherzog]

@johnmhoran I made a mistake in my reference to the Relay documentation because in that case all of the documentation files are located in one folder at: https://github.com/facebook/relay/tree/main/website. There is no separate website project for Relay as we have for package-url so their approach is more direct.
Also we will be pulling website content from multiple package-url repos (e.g. purl-spec, vers-spec, community) so we will need research whether/how we can configure the "Edit this page" links at a more granular level.

I am approving #21 for now to push the website prototype forward, but before we go live with the website we will need to:

• Update the "Edit this page" links to refer to the corresponding source documents in purl-spec, vers-spec, etc. OR
• Remove the "Edit this page" links.

[mjherzog]

Keeping this open to track updates needed to map the "Edit this page links" to documentation files after we finalize their organization and content.