Make glossary and keep consistency on docs

[geikha]

Current draft at:

https://hackmd.io/RCr03ns1RXGa8GBn7BV8xQ

Feel free to edit, comment. We could also discuss terms here. If a term is ok but you'd change the definition, either change it or add a comment on the hackmd. If you want to add a term add it! If you disagree with a term either comment or reply to this issue so we can chat about it! Just setting this as convention so that we don't have trouble chatting bout this. again, feel free to edit and add stuff!