Contributing: notes

[reshamas]

clarify instructions for running backend:

1. default: run both web and api
2. if running only front-end: run mirage

Example:

my_repos/duproj/event-board-web  main ✗                              2h56m ⚑  ⍉
▶ touch .env
(base) 
my_repos/duproj/event-board-web  main ✗                               2h56m ⚑  
▶ nano .env
(base) 
my_repos/duproj/event-board-web  main ✗                               2h57m ⚑  
▶ cat .env
npm run start:dev
(base) 
my_repos/duproj/event-board-web  main ✗                               2h57m ⚑  

example file:
https://github.com/data-umbrella/event-board-web/blob/main/.env.example