Proposal: disallow moving spec pages without corresponding path redirecting

[sambacha]

Is your feature request related to a problem? Please describe.

someone links me to a doc page, suddenly 404 page missing fml

Describe the solution you'd like A clear and concise description of what you want to happen.

Proposal: disallow moving spec pages without corresponding path redirecting

Describe alternatives you've considered using a different rollup stack

Additional context

Example: https://github.com/ethereum-optimism/optimism/blob/develop/specs/fault-proof.md