docs: add info on plugins, themes, and starters (#20025)
docs: add info on plugins, themes, and starters (#20025)

* docs: add info on plugins, themes, and starters

* chore: fix sidebar, add more details

* chore: fix typo

* Apply suggestions from code review

Co-Authored-By: LB <215e3d7c445b99629add69586ce9b88253e8211e@gmail.com>

ilcm96/ilcm96.github.io