Allow for community resources; close #185

app/controllers/application_controller.rb

app/controllers/posts_controller.rb

app/helpers/post_types_helper.rb

app/models/community_user.rb

...te/20201216225353_add_is_freely_editable_to_post_types.rb

db/schema.rb

test/controllers/posts_controller_test.rb

test/fixtures/categories.yml

test/fixtures/post_types.yml

test/fixtures/posts.yml