[CSL-1929] Basic documentation of the launcher (#1982)
[CSL-1929] Basic documentation of the launcher (#1982)

* [CSL-1929] Basic documentation of the launcher

* [CSL-1929] Edit launcher document

* [CSL-1929] Update preface

* [CSL-1929] Formatting fix

input-output-hk/cardano-sl,input-output-hk/cardano-sl,input-output-hk/cardano-sl,input-output-hk/pos-haskell-prototype,input-output-hk/pos-haskell-prototype,input-output-hk/pos-haskell-prototype,input-output-hk/cardano-sl