* docs: adjust wording of ActivityType.Watching enum

Adjusts the xmldoc summary wording of the ActivityType.Watching enum to
fix a wording issue.

* Add D.NET Logo to Open Graph meta tags

* Update DescriptionGenerator
...And update color to suit the logo better

* Disable smooth scrolling due to user complaints

* Remove unnecessary spacing in sideaffix

* Update footer version

* Remove featherlight plugin

As it is unnecessary and can break image tags

* Adjust wordings regarding safe-handling of secrets

* Fix formatting for first bot token sample

* Add badges to homepage

* Minor wording fixes on terminal

* Update to higher quality PNG

* Add Discord.Net.Example in sln for build validation

* Clarify all instances of IAsnycEnumerable

* Clarify overridden props in SocketNewsChannel

* Add returns and params docs for SyncPermissionsAsync

* Remove/fix invalid XMLdoc strings

* Remove AppVeyor and add GitHub badge

this resolves #1006.