[doc] better manual install instructions (#1852)
[doc] better manual install instructions (#1852)

# Description

Add the missing TS scripts compilation from the manual install guide. I also dusted it a bit.

Note: this guide doesn't talk about how to run a kuzzle instance for application development, this will have to wait for the new documentation.
kuzzleio/kuzzle,kuzzleio/kuzzle,kuzzleio/kuzzle,kuzzleio/kuzzle