Reorganised repo structure has broken some simulations

[mrgo0se]

Hi,

Thanks for the great project. It looks like some of the simulations are currently broken due to missing files / changes in the folder structure. When attempting to run the sims from their respective folders with 'make wave' using Verilator 5.024 2024-04-05 rev v5.024-42-gc561fe8ba

flash_tb : No rule to make target '../../src/tangnano20k/flash_dspi.v'
//File is now located at : ../../src/tang/nano20k/flash_dspi.v

video_tb : No rule to make target '../../src/misc/font_8x8_fnt.v'
// File seems to have been removed.

[harbaum]

Please submit a PR if you've fixed this.