Legacy docs take a long time to generate

[rprouse]

I am not sure how to fix this, but until we added the legacy docs, the site regenerated nearly instantly as you made changes. It not takes nearly a minute. This really slows down the dev/test cycle.

We could,

• Not generate the files and use javascript to include them, similar to our current index.php javascript redirect, but do the include
• Pre-generate them and only regenerate when we change headers
• Pre-generate them with lighter docs only headers that don't change
• Figure out how to not generate them during development