MK Implemented BasicCourseTableIndexPage and corresponding test

[mariekarpinska]

Implemented BasicCourseSearchIndexPage.js so that it can be moved from the homepage into a separate page clickable from the menu bar. Additionally, implemented a test for the index page, BasicCourseSearchIndexPage.test.js.
These will be used to close issue 9: Swap the Section Search and the Description Search, which @masonma21 is closing by adapting AppNavBar and App.js and AppNavBar test to reflect the swap of basic course description search (from the homepage) and section search (from the menu bar).

Passed all frontend tests:

Achieved Code Coverage:

[Abelatnafu]

Everything looks great to me. LGTM.

[pconrad]

This PR adds a new page, but there is no way to access this new page yet, so it can't be tested in the app.

But what you could do (and should do so that this can be tested), is to add a story for it in the storybook.

I've done that for you this time.

That way once this job finishes:

At the -docs-qa site, you'll have a link to the storybook entry that you can include in the PR description like this:

And this link takes you to the new page:

https://ucsb-cs156-f22.github.io/f22-7pm-courses-docs-qa/storybook-qa/MKandMM-SwapSectionCourseDescription/?path=/story/pages-basiccoursesearch-basiccoursesearchindexpage--default

[pconrad]

I added a storybook entry.. that's the only problem with the original PR. I took care of it for you this time to show how it's done; next time I'll ask the team to do it.

[Abelatnafu]

LGTM.