Add CSP to Docs Pages

[mason-at-pieces]

@cole-pieces Any specific CSP we want to use here?

Right now I'm using the following:

default-src 'self' https:; script-src 'self' 'unsafe-inline' 'unsafe-eval' https:; style-src 'self' 'unsafe-inline' https:; img-src 'self' data: https:; font-src 'self' https:; connect-src 'self' https:; frame-src 'self' https:;

[mason-at-pieces]

Here is the preview deployment for this: https://documentation-git-380-add-csp-to-d-7849d2-pieces-for-developers.vercel.app/

[cole-at-pieces]

@mason-at-pieces I truly have no idea, I trust your judgment