Remove unnecessary files and links (#4024)
Remove unnecessary files and links (#4024)

* Remove .circleci folder

Seems like circleci link is dead. As the github action is good, there's no need to keep circleci. Remove.

* remove circleci from README

* Remove shippable yml

Doesn't seem to be of use. Remove

* Revert "Remove .circleci folder"

This reverts commit 06b41720f41b002f1575b20ced338b3b73fbe1c6.
CircleCI builds documentation. So keep it.

* Revert "remove circleci from README"

This reverts commit e7ab97e36374c986f4bca913cb666ace9c0ba1de.

Closes #1951 
tbrowder/doc,MasterDuke17/doc,MasterDuke17/doc,MasterDuke17/doc,tbrowder/doc,MasterDuke17/doc,tbrowder/doc,tbrowder/doc