docs: create on boarding docs for testnet validators (#853)

* docs: created Joining the Testnet category

* docs: added Getting Testnet Tokens

* docs: moved getting tokens to 02

* docs: onboarding

* docs: initializing uniond

* docs: onboarding full workflow

* docs: add --home flag to compose.yml

* docs: cleanup and faq

* docs: link to getting binary

* docs: clean and polish

* chore: spelling

* chore: nix fmt

* docs: improved language and stopped suggested CF

* docs: update addresses in onboarding docs

* docs: update genesis link

* chore: nix fmt

* docs: updated seeds

* docs: rpc laddr

* docs: use network mode instead of ports

* docs: added section on state sync

* chore: nix fmt

* docs: onboarding compleation requirements

* docs: show validator

* docs: show address

* docs: show valoper address