SSR Performance Name Change

[AlexanderKaran]

• Changed SSR Performance to Client Side Rendered Performance
  • Updated charts
  • Updates test file
  • Moved to the new object shape to keep things simple
• Updated routing in the tests to match new names (went back for client-side rendered here)
• I changed the other SSR tests to SSR Throughput. Once the load test PR is in, we can decide if we want to keep it
• Updated tests and other documents that refer to it

Charts now look like this (if we need to add more explanation, we can later in a follow-up)

Main Page

Run Time Page

Slug Page

Closes #240