Update ESGF website with CWT info

[agstephens]

Update the site:

• Fork github.com/ESGF/esgf.github.io/
  • See: https://github.com/cedadev/esgf.github.io
• commit updates, and create a PR for SA to merge

Pages to look at:

• index
• https://esgf.github.io/projects.html - https://www.esgf.io/projects.html
• Wikis: https://www.esgf.io/wiki.html
• Software: https://www.esgf.io/software.html
• Working groups: https://www.esgf.io/working-groups.html
• Acknowledgement: https://www.esgf.io/acknowledgments.html
• Menu: Documents: remove: "Compute Service Certification"

[agstephens]

@cehbrecht: Please can you check any mentions of the CWT and compute on the pages listed in this ticket. Sasha has merged the changes so the live pages can be checked. Let me know if anything needs fixing/changing. Thanks