Update Agent Builder documentation and images such that everything agrees with current wording on client components and unity editor options.
Removed most references to GitHub
There are some images that still include "Save to GitHub" and "Load from GitHub" but we'll need to re-wangjangle these docs to account for C# stuff anyway (REG-1387) so we can be more thorough at that point.
Commented out section on manually modifying generated code. This won't be possible for zip bots (our "officially-supported" flow) until we add an option for users to download their zipped code (REG-1386), at which point we can update + uncomment it.
Client PR: https://github.com/Regression-Games/RegressionClient/pull/333 RGBots PR: https://github.com/Regression-Games/RGUnityBots/pull/85