Revert "Fix: Mismatched tag"

This reverts commit 8622f7e729dce4a6e9c3d26f4ebbf59a96ff9a86.
Revert "Add settings icons for theme manager"

This reverts commit 802a98214fb6b1eafc3300a2e2dd8c4ee7abcdee.
Revert "Add Theme Engine"

This reverts commit 745c996018f43c201f764eb926a29145577e3a12.