Port website fixes (#20993, #20995, #21009) from v1.9.x branch (#21015)

* [v1.9.x] Update website footer to include required Apache links (#20993)

* Update footer to include required Apache links, according to https://www.apache.org/foundation/marks/pmcs#navigation

* Better layout with col-3 class.

* Fix 'module 'jinja2' has no attribute 'contextfilter''

* Update Makefile

* Update Makefile

Co-authored-by: Bartosz Kuncer <bartosz.kuncer@intel.com>

* [v1.9.x] Fix css for Apache links, add to Python docs. (#20995)

* Add Apache links to python docs footer, update hostname in CI script.

* Don't use relative_url function.

* Add link to ASF.

* Fix medium blog integration. (#21009)

* Update broken links to fix linkcheck.

Co-authored-by: Bartosz Kuncer <bartosz.kuncer@intel.com>
Co-authored-by: matherit <97054789+matherit@users.noreply.github.com>