Use django-crispy-forms with the addition of status pick list for Missions filter view

[MBARIMike]

The settings for django-crispy-forms are for using bootstrap4, so the .css and .js entries in the last commit in this PR needed to be changed. These lines (and maybe more) need to be updated for an update to Bootstrap:

• https://github.com/mbari-org/SeafloorMappingDB/blob/b2f2c7d17a8a171ef6c3f59d92947671624f439f/smdb/config/settings/base.py#L212
• https://github.com/mbari-org/SeafloorMappingDB/blob/b2f2c7d17a8a171ef6c3f59d92947671624f439f/smdb/config/settings/base.py#L215

(Here's the old commit that mistakenly switched the .css and .js lines from bootstrap4 to bootstrap5: https://github.com/mbari-org/SeafloorMappingDB/commit/4133a336b3418e276d0dfceacbd6d6bbd8446a35)