Update README.md for Studio's first full release

[jamesreprise]

What is the goal of this PR?

When user's visit Studio's GitHub page, we want them to see Studio as a fully featured and released product rather than an alpha version of a product.

What are the changes implemented in this PR?

We've updated Studio's README.md to bring it up to speed with its first full release.

• Added images and brought remote images that could break at any time to our local repository.
• Provided detail and illustration of a few of the most important features of Studio.
• Fixed broken links that pointed to invalid docs.
• Updated all links to use https.