[REFACT] delete unused assets

[AucT]

There are a lot of files in static which we do not use. Need to delete.

Intro: https://www.loom.com/share/e6b4e396db4f44cca789b903a9d76c9c

All assets not used in our layouts and for dev.to should be deleted.

Some usage:

1. HTML has like absUrl
2. CSS has like background-image: url("/wp-content/uploads/2022/10/confirmation-icon.svg");

TODO:

1. Move all used js and CSS to static/{js,CSS,img}
2. Delete all other assets