Remove unused files

I don't see this files having any effect on the site besides leading to
confusion.
fixes #7565 - license under Creative Commons
Merge pull request #47 from stbenjam/7565

fixes #7565 - license under Creative Commons
Fixes #7593: Fix formatting issues.
fixes #7564 - add community section to web site
Merge pull request #46 from stbenjam/7564

fixes #7564 - add community section to web site
refs #7564 - add support for footer to community layout
Merge pull request #50 from stbenjam/7564-fix

refs #7564 - add support for footer to community layout
Merge pull request #49 from ehelms/fixes-7593

Fixes #7593: Fix formatting issues.
Merge pull request #41 from iNecas/cleanup

Remove unused files
fixes #7658 - adding system requirements
Merge pull request #53 from jlsherrill/7658

fixes #7658 - adding system requirements
Fixes #7632, #7637: Adding FAQ and Debug certificate sections.
Merge pull request #51 from ehelms/fixes-7632

Fixes #7632: Adding FAQ section.
fixes #7661 - documenting needed open ports
Merge pull request #54 from jlsherrill/7661

fixes #7661 - documenting needed open ports
refs #7558 - document need to trust katello ca for encrypted websockets