Move the existing file formats documentation to this repository

[rdw-software]

Goals:

• [ ] The existing file formats documentation is transferred from the RagnarokFileFormats repository to this documentation website
  • [x] README
  • [x] Community Projects
  • [x] GAT
  • [x] GND
  • [x] RSW
  • [x] SPR
  • [ ] ACT
  • [ ] EZV
  • [ ] STR
  • [x] PAL
  • [ ] RSM
  • [ ] GR2
  • [x] GRF
  • [ ] RGZ
  • [ ] GPF
  • [x] EBM
  • [ ] IMF
  • [ ] Lua/LUB
  • [ ] Relevant asset files
  • [ ] Research Notes (if relevant)
• [x] All existing issues are either moved here (if still relevant), or closed
• [ ] All branches are deleted (or merged/reviewed), especially the local ones with ongoing research
• [x] A note in said repository's README explains that the contents have moved (and why this is the case)
• [ ] All contributors are credited on the documentation website, with a note linking to their contributions