Add Loic to cells list

@dachary @pauloviadanna @__xitij__ FYI, adding @dachary to the list, and to the epics spreadsheet.

Btw, I had originally assigned @dachary to Bebop due to the task he had initially taken. But currently it looks like both Serenity and Bebop are fine in capacity - do you want to keep it as is? Since we are right at the beginning we could still assign him to Serenity instead if that would be more helpful, on my side it looks similar. CC @symbolist @itsjeyd

Also how can the handbook be updated now, once this is merged?

@dachary Can you let me know how many hours you would like to do per week? I'll then need to update it in the epics spreadsheet and in jira tempo.