[REG-1364] Verbiage around "Unity context" agrees with client and Unity editor

[abeizer]

• 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: Regression-Games/RGUnityBots#85

[analogrelay]

One slight reword suggestion and a non-blocking comment about commenting out vs deleting content.

[analogrelay]

While you're here, we call the button "Create Bot", so it seems odd to talk about it as "Create a new AI":

Suggested change

	Create a new AI from the Bot Manager and select `Agent Builder` from the list of creation options,
	Create a new Bot from the Bot Manager and select `Agent Builder` from the list of creation options,

[abeizer]

There's many references to "AI" throughout our documentation. It was an attempt to separate the concept of AI logic from bot records, but at this point we are referring to bots so many different ways that I think we need a dedicated task to settle on what terminology to use and update the docs to make them consistent. This isn't something we want to start doing in the Agent Builder page yet

[analogrelay]

I assume this syntax is commenting this out? Can we just remove it and rely on Git history? Or, if you want to preserve it somewhere a little easier, maybe copy this old code in to REG-1386?

I generally prefer if we can avoid committing commented-out code since it adds extra noise that can quickly get out of date. If we don't address REG-1386 for six months (could happen, who knows how our priorities will shift 😄) then this noise will still be here.

[abeizer]

Yes, those are markdown comments :-)

Removed