Explore moving off of Algolia for site search

[kltm]

As discovered in #574, we are no longer able to completely index the site for search using the "free" Algolia keys. We'll either need to pay or finally move to a FOSS solution. We should explore the latter--search and indexes are pretty easy.

Noting that the priority has not been set, but that he following files are no longer allowed to be indexed:

• gorefs.html
• GO_REF/0000012.html
• GO_REF/0000024.html

[kltm]

@pgaudet and @suzialeksander to determine severity (and project, if needed)

[suzialeksander]

editing my previous comment in this spot- that question is covered in another ticket

[kltm]

Just wanting to pop this onto radars again. Tagging @pgaudet