Make clear that web app can be used for local filesystem

[jgadsden]

Describe what change you would like: The documentation suggests that github is a requirement to run Threat Dragon as a web application, which is incorrect The documentation needs to be changed so that it is clear that any of these will work for the web application:

• local file access
• github
• bitbucket
• gitlab

Context:

[jgadsden]

fixed in commit 2d1c6ed