R1:ef30820cf4d9

Decrease fragility of `conpherence-pontificate` behavior

Summary:
Currently, this behavior binds a ton of IDs. This makes the behavior fragile: if it is invoked on a page without all the right elements, some `JX.$()` tends to explode.

Instead, don't assume anything is present on the page. This allows the behavior to be invoked on other pages (like the "New Conpherence" page) or pages without some elements (like some future thread-only mobile view) without creating JS errors.

Test Plan:
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