David Mehren 9499add64c Tighten up default Content-Security-Policy ...

This commit changes the
- default-src to none, so everything is disallowed by default
- base-uri, connect-uri and font-src to self,
  so these are restricted to the current origin
- frame-src to allow SlideShare, Vimeo and YouTube
- script-src to the specific paths that are used by HedgeDoc to serve scripts.
  This explicitly does not include the /uploads route
 - style-src to the specific paths that are used by HedgeDoc to serve styles
 -

Signed-off-by: David Mehren <git@herrmehren.de>

2021-08-15 00:22:30 +02:00

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