#3818 availability changes

[wavehassman]

Changes

Made the edit button open the edit modal, and the view availability button combine editing your availability and viewing everyone's availability

Screenshots

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Closes #3818

[JoshuaGoldberg]

This looks great! we discussed some changes already, and the routes have already been fixed, but I would just double check to make sure the available members panel doesn't cause the availability view to shift up and down when selecting/deselecting timeslots. Also, there seems to be something slightly off with how view availability selects the week (edit works fine), so that likely needs to be tweaked. Other than that, the main thing would be to port over the frontend design to switch from grid to table, as that would make it much nicer and not deprecated.