Docs: single-page CCO HTML (anchors)

[tinazunner]

Adds a generated docs/index.html with anchors for every Class and ObjectProperty in the merged CCO file.

Each term has:

• fragment ID anchor (e.g., #ont00012345)
• label-based anchor (e.g., #sensor)

Enables IRI dereferencing via GitHub Pages.

[tinazunner]

This PR adds a generated docs/index.html and a small Python script. The goal is to provide a simple one-page HTML with anchors for all Classes and ObjectProperties in the merged CCO file.
The page is static, searchable, and lives under /docs so it can be served via GitHub Pages.
Anchors match IRI fragments (e.g., #ont00012345) and also include label slugs (e.g., #sensor).
This enables immediate dereferencing of CCO IRIs, which is currently blocking downstream use.
Once merged, please enable GitHub Pages (Settings → Pages → Branch: main (or develop), Folder: /docs). After that, IRIs will resolve directly.

[johnbeve]

@tinazunner Love this obviously, but could we migrate these changes over to the cco-webpage repository instead? That way we keep all the webpage content separate from CCO ontology development.

[johnbeve]

For those evaluating the content of this PR, please see the here

@neilotte @mark-jensen