Retire the on-site documentation and align with docs.overture.bio v2 - #419

Changed pages include:

• index.html - view
• 404.html - view
• 404/index.html - view
• about-us/index.html - view
• acknowledgements/index.html - view
• case-studies/index.html - view
• community/index.html - view
• getting-started/index.html - view
• privacy/index.html - view
• products/index.html - view

There are more changes not included in the list