Revert #333
Revert #333

Revert https://github.com/matrix-org/matrix-react-sdk/pull/333/files since sanitizer blindly allows urls with no scheme, meaning  // links can be used to fetch images over whatever scheme you serve vector over (ie. normally http/https).

aperezdc/matrix-react-sdk,aperezdc/matrix-react-sdk,matrix-org/matrix-react-sdk,aperezdc/matrix-react-sdk,matrix-org/matrix-react-sdk,matrix-org/matrix-react-sdk,aperezdc/matrix-react-sdk,matrix-org/matrix-react-sdk,matrix-org/matrix-react-sdk,matrix-org/matrix-react-sdk