updated ngrok to correct port

per @jeromeky's email. Thanks!
Update bounces.html

the existing caution is no longer an issue. We now return the response below

{"error": "error in email: no valid parameters provided. Use delete_all=1 to remove everything"}
removed warning about deleting all

due to an API change this is no longer the case, related: 70d851a846acee555fb48e67d11a45023662d0c6
change wording in Customer Subuser Whitelabel API Params
rm update ruby-version
replaced enable with enabled in some SMTPAPI examples
Minor typo in API example.

Insert missing ampersand
updated to be more explicit about attachments

updated the parse webhook docs to be more explicit about how how files
come to the script
misc webhook example changes

minor changes to the web hook examples to clarify them more, make code
work and aligned with other examples

moved webhook examples to be with other code examples
change fonts to load via https
remove protocol from root url
change font assets to schemaless URIs
version bump