Doc updates and deploy (#448)

* Updated docs and build process

* Added doc workflow

* Removed doc deploy from gitlab ci

* Added missing cmakelists file

* Disable doc build in ci pipeline

* Set python version in doc deploy

* Fixed python version and added doxygen as a dependency

* Fixed define and added enc check stage to doc build

* More debugging

* Update AWS action

* Trying different AWS checkout

* Added role to assume

* Added permissions section

* Reverted to old commit

* Brought pipeline back inline with ARD pipeline

* Changed to artifact upload and download

* Added missing index.rst