removed smtpapi configuration note

this was added in error and is not in fact possible
SMTP -> SMTP Relay

For clarity's sake
Clean up section tags

Added in a secondary comparison example for "John" to show how it differs between two emails

Updated SMTPAPI to SMTP API

Cleaned up references to sections, section keys to all be section tags
Formatting tags note

Added the note from substitution tags here, since users may come to this page before that one.
Merge pull request #585 from mbernier/patch-16

Formatting tags note
merge mbernier/patch-15
Merge branch 'mbernier-patch-15' into develop
Merge pull request #581 from mbernier/patch-12

SMTP -> SMTP Relay
Clean up Substitution tags

Removed Redundant note about substitution tags in subjects
Changed sendgrid.com to example.com

Added a second code block to show a comparison of the different emails that are generated.
Merge pull request #586 from mbernier/patch-17

Clean up Substitution tags
added notes and warnings

Copied from substitution tags page and modified to fit section tags
Tags vs values

Tags are the replaceable strings, values are whet gets replaced. Changed wording to be more specific
Clean up Unique Arguments

Added header to the Webhook post data
Linked Webhook
syncd up the unique arguments with the webhook payload
Linked Email activity tab to docs
Merge pull request #589 from mbernier/patch-20

Clean up Unique Arguments
Merge pull request #588 from mbernier/patch-19

Tags vs values
Create Google.md

creating partner page for Google. More partner pages to come soon
Update index.html

adding Google to the index, links to the newly created google page
Cleaned up the tips at the top of the page

I am not sure about this change being the right move here. We have a problem where there are a couple caveats here that we need people to know about. In the original warning box, we had multiple instructions. It makes sense to delineate each item individually, but it does not make sense to have 4 info/warning boxes at the top of the page.
Moved comment about html tags

This comment about HTML tags was found on the SMTP API Overview and not in context on the page where it makes the most sense to have this message.
Cleaned up Web API Overview

There's no need for mention of our API Workshop since it doesn't exist any longer. Also, this could be confused with the Code Workshop
Updated headers for responses to make response codes, Errors and Success all h3s
Added an example URL 
Added example URL with user/pass params