[x] Ignores the execution of the (very long) tests if there are changes in the docs directory or if the mkdocs.yml and deploy-static-site.yml files are changed.
[x] Adds a custom 404 page (the same as the blog page).
[x] Adding new features (automatic copy code, breadcrumb navigation, navigation pruning, etc.).
[x] Plugin: preserves HTML formatting in the navigation and table of contents.
[x] Plugin: image zoom functionality.
[x] Plugin Privacy: adds automatic download of external libraries, and set target=_blankrel=noopener on external links.
fix #306
docsdirectory or if themkdocs.ymlanddeploy-static-site.ymlfiles are changed.404page (the same as the blog page).target=_blankrel=noopeneron external links.mkdocs.yml.