Modified installation instructions for securedrop development.
Modified installation instructions for securedrop development.

Installation instructions were out of order and the wording was slightly confusing. Attempted to make the instructions sequential and more understandable. Notably, inlcuded instructions about creating the GPG key before the copying and modification of the config file.

mark-in/securedrop-app-code,mark-in/securedrop-app-code,mark-in/securedrop-app-code,mark-in/securedrop-app-code