R1:742ee44960b0

Fix show/hide applications on homepage

Summary:
Fixes T2482. After D4792, menus have more formal structure, but previously we were just shoving some `<div>` into the middle of the thing. This no longer works correctly, since we end up with `<div class="nice-formal-div"><div></div>`.

Just put IDs on all the items we're going to show/hide instead so we don't have to render any half-tags.

Test Plan: Home page show/hide works again.

Reviewers: btrahan, chad

Reviewed By: btrahan

CC: aran

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