Breadcrumb for blog pages, and per-page/section config

[chalin]

• Fixes Document options for breadcrumbs #810
• Fixes How hide breadcrumbs navigation on some docs pages ? #983
• Fixes Blog pages and sections: provide better navigation under mobile #1788
• Adds breadcrumb navigation to blog pages
• Adds support for per-page or per-section disabling of breadcrumbs
• Updates the breadcrumb docs
• Closes Hide Breadcrumb navigation from particular pages not the entire website #1248 by superseding it

Preview:

• https://deploy-preview-2161--docsydocs.netlify.app/blog/2024/year-in-review/ illustrates breadcrumbs for blog pages, in support of Blog pages and sections: provide better navigation under mobile #1788
• https://deploy-preview-2161--docsydocs.netlify.app/project/changelog/ illustrates hidden breadcrumb for all pages in a section (How hide breadcrumbs navigation on some docs pages ? #983)
• https://deploy-preview-2161--docsydocs.netlify.app/docs/ illustrates Hide breadcrumb for docs index page #944 (support was actually added via Hide index-page single breadcrumb #2160)

[chalin]

/cc @svrnm @theletterf