Remove references to HTTP application base

Fixes #1371.

I think I got all of them but egad it's not the easiest string to search for. In future can we name our settings "elephant" or "dodecahedron" kthxbai

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Pre-Merge Content Checklist

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[ ] The title, template, and date are all set
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[ ] File does not use CRLF, but uses plain LF (hint: use cat -ve <filename> | grep $'\r' | wc -l and expect 0 as a result)
[ ] Has passed bart check
[ ] Has been manually tested by running in Spin/Bartholomew (hint: use PREVIEW_MODE=1 and run npm run styles to update styling)
[ ] Headings are using Title Case
[ ] Code blocks have the programming language set to properly highlight syntax and the proper copy directive
[ ] Have tested with npm run test and resolved all errors
[ ] Relates to an existing (potentially outdated) blog article? If so please add URL in blog to point to this content.