Revert "Add 404 page."

This reverts commit 93e2d9711cf1da3269e559cb0b6e549058cf4a1b.
Revert "Remove `/components` from gitignore"

This reverts commit 94ad29988e873f1bb11d98075e342a995cf73d24.
Revert "- Add Corsnection client app."

This reverts commit 67aad7ea21bbd2f6b65527f7ffb074ad5d06cda2.