Revert "Initial commit."

This reverts commit 3bfe24c440cf22fd745f118ba3f1030719d8b3ee.
Revert "Revert "Initial commit.""

This reverts commit 8ff0b75aa3d350310c07ee452805ced8e142b90e.
Revert "Remove some files."

This reverts commit 6d9ca6b6896b08afdf7cbdc410e3225ebfe03117.
Remove unneeded files.