Reorder first part for newer AWS console

[sebastian-correa]

Closes #20.

Most of the changes in this PR are rephrasing and reordering lists, that's why there are so many additions and deletions.

Important changes follow:
set-up-users:

1. Recommend a password manager in set-up-users.

Introduction:

1. Clarify that the frontend isn't fully functional.
2. Add basic explanation on how to navigate AWS's console.
3. Add suggestion to branch master before starting, as the user will be committing some things.
4. Explain how to get logs from EC2 instances.

General:
Parameters for the parameter store currently have a static name. For an external user, this is not a problem. For people using Tryolabs' playground account this is a problem because using a unique parameter name prevents multiple users from doing the workshop at the same time and could cause issues with old parameters.

Therefore, all parameter naming suggestions have been changed to make them unique to each user. Notes have been made in all files where /prod/ parameters are referenced to instruct the user to change relevant files and to be consistent.