:recycle: added support for inactive memberships

backend/db/migrations/20210527174440_create_memberships_table.js

             table.integer('grouping_id').notNullable() // To
             table.string('membership_type', 128).notNullable() // Don't over normalize
             table.boolean('can_edit').notNullable()
+            table.boolean('is_active').notNullable()
         })
 }
 

backend/db/mock.js

         { response_id: 9, profile_id: 5, response_key_id: 3, val: 'This job posting is awful' },
     ],
     memberships: [
-        { membership_id: 1, user_id: 1, grouping_id: 1, membership_type: '_admin', can_edit: true },
-        { membership_id: 2, user_id: 1, grouping_id: 2, membership_type: 'recruiter', can_edit: true },
-        { membership_id: 3, user_id: 1, grouping_id: 3, membership_type: 'participant', can_edit: false },
-        { membership_id: 4, user_id: 2, grouping_id: 3, membership_type: 'participant', can_edit: false },
-        { membership_id: 5, user_id: 4, grouping_id: 4, membership_type: 'participant', can_edit: false },
-        { membership_id: 6, user_id: 2, grouping_id: 4, membership_type: 'participant', can_edit: false },
-        { membership_id: 7, user_id: 3, grouping_id: 5, membership_type: 'participant', can_edit: false },
-        { membership_id: 8, user_id: 1, grouping_id: 5, membership_type: 'participant', can_edit: false },
+        { membership_id: 1, user_id: 1, grouping_id: 1, membership_type: '_admin', can_edit: true, is_active: true },
+        { membership_id: 2, user_id: 1, grouping_id: 2, membership_type: 'recruiter', can_edit: true, is_active: true },
+        { membership_id: 3, user_id: 1, grouping_id: 3, membership_type: 'participant', can_edit: false, is_active: true },
+        { membership_id: 4, user_id: 2, grouping_id: 3, membership_type: 'participant', can_edit: false, is_active: false },
+        { membership_id: 5, user_id: 4, grouping_id: 4, membership_type: 'participant', can_edit: false, is_active: true },
+        { membership_id: 6, user_id: 2, grouping_id: 4, membership_type: 'participant', can_edit: false, is_active: false },
+        { membership_id: 7, user_id: 3, grouping_id: 5, membership_type: 'participant', can_edit: false, is_active: true },
+        { membership_id: 8, user_id: 1, grouping_id: 5, membership_type: 'participant', can_edit: false, is_active: true },
     ],
     groupings: [
         { grouping_id: 1, grouping_name: '00000000_siimee_', grouping_type: 'company' },