Potentially add a herodevs tag for products supported by HeroDevs

[AndreAngelantoni]

Currently the guidelines for tags don't have a category for products that are receiving extended support from third-party vendors. Scroll down to the section on tags here for the full discussion.

This change would involve two pieces:

1. update the tag guidelines to read (third bullet point is new):

must be added for one of the following reasons:

• set a product family such as linux-distribution, web-browser, mobile-phone or web-server,
• set a product vendor such as adobe, amazon or apache,
• set a third-party extended support partner, or
• set a runtime dependency such as java-runtime, javascript-runtime or php-runtime.

2. tag all products that receive HD extended support.

Additional vendors who provide third-party extended support would be able to tag the products they support.