Add suggestions for customizing a new project based on this template

[garrison]

What is the expected enhancement?

Although this template is rather minimalist, a user creating a new project might want to spend a few minutes at the very beginning trimming it down further. Let's make a file (e.g. docs/ideas-for-trimming.md) which contains suggestions for such trimming. Some ideas it could include:

• disable pylint (and possibly black) early on in a project's development; re-enable it later once development matures a bit
• remove qiskit from requirements.txt if the project does not depend on qiskit
• remove docs/images/logo.png
• remove ideas-for-trimming.md itself and any other files which are specific to the template

[garrison]

I've broadened this issue to include all aspects of customization when the initial project is created. Before trimming, one should typically run git grep (or even a platform-independent sed invocation) to identify links and identifiers that should be updated, and also move some files to their intended destinations (e.g. the prototype_template directory).