Dogusata/add code diff to syntax highlighter and file description tooltip

[dogusata]

Problem

• SyntaxHighlighter should support diff view. Since it is already there with prism.js it has to be enabled.
• FileItem component should support markdown tooltips
• Sometimes tooltips exceeding the screen edges

  Solution

• Updated SyntaxHighlighter component to support diff view too
• Added tooltip ability to FileItem component
• Fixed tooltip edge bleeding issue.

License

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.