docs: edit-page links point to view-only tree URL

## What happened
The Docusaurus docs configuration sets the docs edit URL to:

https://github.com/clearlydefined/clearlydefined/tree/main/

in docusaurus.config.js. The blog edit URL is also a repository URL without the edit path.

Docusaurus uses editUrl as the base for the generated “Edit this page” links, so this configuration produces links under GitHub''s tree view rather than the edit view.

## Why it matters
A reader who clicks “Edit this page” is taken to a read-only repository browsing page and cannot immediately propose a documentation change.

## Suggested fix
Use the edit form as the base URL, for example:

https://github.com/clearlydefined/clearlydefined/edit/main/

or remove the edit links if they are not intended to be offered. Please verify one generated docs link and one blog link after the change.

Open docusaurus.config.js and inspect the docs and blog editUrl settings. Change the repository base to the edit path, then verify one generated docs link and one blog link open GitHub’s edit view rather than the tree view.

Written by the indexing model from the issue text.