Fix current version breaking side menu (remove bootstrap, custom css, custom js, custom template) #177

Job	Run time
Python 3.12 Tests	35s
Python 3.11 Tests	38s
Python 3.10 Tests	32s
Python 3.9, with Code Coverage	35s
Python 3.9, Windows	1m 24s
Python 3.9, MacOS	58s
Twine	33s
Document Checks	29s
Code Style Checks	54s
ASDF Standard Document Build	46s
ASDF Document Build	57s
ASDF-transform-schemas Document Build	57s
ASDF-coordinates-schemas Document Build	41s
ASDF-wcs-schemas Document Build	40s
ASDF-astropy Document Build	50s
rad Document Build	44s
roman_datamodels Document Build	48s
romancal Document Build	1m 17s
stdatamodels Document Build	1m 15s
jwst Document Build	2m 14s
	17m 47s

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