Skip room join until we run into a `403 Forbidden` and peek into `world_readable` rooms#272

MadLittleMods wants to merge 4 commits intomainmatrix-org/matrix-viewer:mainfrom

madlittlemods/show-world-readable-roomsmatrix-org/matrix-viewer:madlittlemods/show-world-readable-roomsCopy head branch name to clipboard