Add "The RStudio IDE" and "The Four Corners of RStudio" into Episode 1

[thoughthollow]

Per melissavanbussel:
"The order of topics is likely to be confusing for beginners -- they're told to start using the "Console" in Episode 1, but the "Console" isn't introduced until Episode 2. I would recommend adding the "The RStudio IDE" and "The Four Corners of RStudio" into Episode 1, immediately after the "What is programming?" section to address this confusion. Expecting users to run code before being introduced to how to run code in the IDE is likely to be confusing."

To do:

• Adding the "The RStudio IDE" and "The Four Corners of RStudio" into Episode 1 immediately after the "What is programming?" section.