Switch from GitHub Wiki pages to hackmd.io for community meetings notes

[OrlinVasilev]

Hello Community!
On our last community meeting we discussed the possibility to use hackmd.io instead of the GH wiki pages.
The pros are that we have better visual and editing experience and in particular parallel edits.

Example here: https://hackmd.io/CyQk5FdVQwWObMLVNqxW1w?view
Please vote with +/-
Orlix