Updates for CCPP version 7 release

[mkavulich]

Updates to the technical documentation in advance of the CCPP v7 release. The rendered version of this branch can be found here: https://mike-k-tech-doc.readthedocs.io/en/latest/

Note that not all items in #71 have been completed; I have checked off the items that I was able to finish.

To do:

• [x] Update all links to Sci Doc once published
• [x] Update all links to code in repository once tag is created

[mkavulich]

@climbfuji Did you have any more comments? If not I'll go ahead and merge this PR.