Revert "Initialize basic flask scaffolding."

This reverts commit 10534f7a54aa92c1c671f7738b0a25dd1e0079c0.
Work scaffolding properly.
Merge remote-tracking branch 'origin/master'
Get b64 buffer of screenshot ans save it to png.

Backend pass image data to frontend not using file but buffer.
So write test of it.
Move selenium test file to test folder.
Make html file which have image of given url.
Return base64 format of png image.