Update ideas section

README.md

@@ -24,12 +24,9 @@ make webapp
 
 ### Ideas
 
-- If the URL does not start with `www.`, will entering `www.<url>` also work?
-- If the URL is HTTP, is it possible to access the site via HTTPS (recommended)?
-- If the URL is HTTPS, is it possible to access the sire via HTTP (recommended: redirect to HTTPS)
 - Check which cookies are set and with what settings (expiry, domain)
-- submit the URL against a service like Google Page Speed and retrieve the score
+- submit the URL against a service like Google Page Speed and retrieve the score (see https://github.com/addyosmani/psi/)
 - Check against our own webpagetest.org instance
 - Detect which one of the well-known CMS is used
-- Certificate expiry warning
+- Warn in case a certificate will expire soon
 - Favourite icon availability check