Update README

[tdauth]

• Replace words Hydralisks.
• Improve the description of the scenario.
• Improve the description of the concept of time inversion.
• write "A Tenet-style prototype map for Warcraft III: Reforged."
• Add screenshots like for the Coronavirus map.
• Link to a playlist with all YouTube videos or embed previews to the videos.

[tdauth]

Move the technical descriptions down in the README and move the scenario explanation, download, videos and screenshots up.