Add Wiki to drat

[jan-abel-inwt]

• Add "FAQ" & "How to report bugs" pages to drat wiki.
• add link to the drat wiki in each app wiki & remove these pages
  • [x] bmsc-app
  • [x] Bpred
  • [x] iso-app
  • [x] osteo-bior
  • [x] plotr
  • [x] ressources