Set up best-case local website copy for experimentation

[thibaudcolas]

Depends on #535. Once that’s done,

• Make a copy of the local site mirror
• Remove all <script> elements
• Remove all <iframe> elements
• Remove all <video> elements
• Remove all <img> elements
• Other "best-case" changes we could make?

[thibaudcolas]

Ideally this is something we would make reproducible for other sites / future R&D, doesn’t need full automation but at least a regular expression. With something like grep / ag silver search / ripgrep. Or sed.