Not sure on #1 but I will answer #2.  YES you can either rename the workspace, or create a new workspace and add your target(s).  As always, make a backup folder in case you ever need to go back.  You will have to close PB to rename it, but it's not a problem.

>>1) Is it possible to use SVN to connect directly to my repositories on Github?  For now, I will be the only
>>person working on the projects and would prefer to have a simpler process.  If so, can someone outline
>>the way this is done or possibly point me to an article that focuses on this type of setup?

I don't understand the question.  SVN and Git are two different version control systems.

>>2) In Bruce Armstrong's video, he states that the name of the PowerBuilder workspace must match that of
>>the Github repository.  That is a problem for me because all of my workspace names have spaces and
>>Github automatically creates the repository with dashes where my spaces would be.  Can I rename the
>>workspace without causing a problem in the project?

That is fixed in R3.  In that release the repository URL is just a single line edit field.  You can put in whatever your repository URL is.