Upgrade site to Bootstrap 5 (OBOFoundry#2057)

* Upgrade to bootstrap 5

* Reformulate

* Draft 1

* More cleanup

* Add missing frontmatter

* Update create-html-grid.py

* Add sticky footer styling

* Improve table styles

* Update index.html

* Update bootstrap

* Remove incorrect usage of tooltip

* Update index.html

* Update index.html

* Fix arrows

- Remove more over-complicated HTML structure
- Fix sort table use of glyphicons
- Make selector more specific by using a class instead of an element name

Author: cthoyt