updated indexes to include more

added keywords and better indexing of other elements

closes #290
modified to handle exception

made much less breakable and also classified keywords as part of SEO
updated readme to reflect search keywords
Merge pull request #429 from sendgrid/develop

Update webhook docs
added app settings links
added tracing to linklint
added docs for activating a version
Fix spelling error.
Fix spelling error.
Merge pull request #432 from SeanTAllen/develop

Fix spelling error.
added bold styling to h1-h3
Updated with current template and version response format
Merge branch 'be-bold' into develop
better link linting
corrected template link
Merge pull request #435 from jdzimmerman/MEME-2032

MEME-2032 Updated Template Engine API with current template and version response format
Fix typo in nodejs webhook example
fixed footer styling
Merge branch 'develop'
Create a feedback modal and refactor structure

Closes #392