test(resolvers): add integration tests for 'PostResolver'

test: add unit tests for 'PostResolver'

feat(resolvers): add 'PostResolver'

test: add tests for 'PostService'

feat(services): add 'PostResolver'

style: run eslint

feat(entities): add 'Post'

chore: remove migrations

chore: add script to run 'husky install'

test(communityresolver): add integration test for 'getCommunity' query

chore(authresolver): test that 'session-access-token' max age is 15 mins

test(communityresolver): add unit case for 'getCommunity' query

feat(communityresolver): add 'getCommunity query

feat(community): add 'bannerHeight' field

chore(testresolver): drop 'communities' table in the 'clearDB' method