Update Documentation

[lmdulick]

Documentation-only update regarding aesthetic of README doc, "How-To," and warnings.

[lmdulick]

A note about the proposed changes:

• The inclusion of two asterisks (** [word] **) on either side of a word (ex. The Movie Database) bolds that word within the paragraph, improving the overall readability of the README and emphasizing certain important words to the reader.
• The shell feature allows a user to simply click the copy icon for a command, rather than requiring the user to highlight and copy the command themselves. For Example:

This is a command.

• Finally, three hashtags (###) makes a subheading, improving the grouping and overall readability of the README. For Example:

Heading

Subheading

Sub-Subheading