Misc backend tasks

[JasonLovesDoggo]

• refactor api3's listing & lookup filtering methods (maybe mixin?) (in obj/main.py)
• Add a delete account button on the profile page (set is_active == False)
• Update onboarding guide (@JasonLovesDoggo)
• https://docs.allauth.org/en/latest/common/admin.html migrate to this (as well as scav)
• test inactive clubs abilities (use django hijack)
• Update the exec guide to include resending emails (@JasonLovesDoggo)
• change default of expo notif tokens to {}
• write full OpenAPI spec for api3 (look into drf-spectacular & drf-yasg) #246
  - [ ] Dockerify komorebi and update caddy accordingly (@nyiyui?)
• add no batch mixin to some model admins

[JasonLovesDoggo]

class NoBatchDeleteMixin(object):
    def get_actions(self, request):
        actions = super(NoBatchDeleteMixin, self).get_actions(request)
        if 'delete_selected' in actions:
            del actions['delete_selected']
        return actions