Update security.txt - #52

Changed pages include:

• index.html - view
• 404.html - view
• about/index.html - view
• blog/index.html - view
• contact/index.html - view
• why/index.html - view
• blog/2022-06-28-announcing-divviup-funding/index.html - view
• blog/combining-privacy-preserving-telemetry-with-differential-privacy/index.html - view
• blog/command-line-intro/index.html - view
• blog/dap-update/index.html - view

There are more changes not included in the list