Add dockerfiles for various existing images

[gonuke]

There are many docker images that we already rely on for:

• CI
• website building

Please add their dockerfiles here: @ljacobson64 @bam241

[ljacobson64]

The dockerfile for DAGMC is already in DAGMC. Does it need to be duplicated here?

https://github.com/ljacobson64/DAGMC/blob/develop/docker/Dockerfile

[gonuke]

Probably fine to not duplicate, but perhaps the README file can have a catalog that points to it's location