Fixed README links

[ajhawkings]

Changes:

• Made the beta releases point at the release page
• Changed FAQs to docs (the original link (https://help.cookiejarapps.com) returned a redirection error)
• Also made the help page point at the docs (the original link (https://smartcookieweb.com/help) returned a 404)
• Added a clickable email link
• Added a link to the developer docs

Things that still need doing:

• Fixing contributors page (https://smartcookieweb.com/contributors.php) - returned 404 and I could find no replacement (lines 23 & 64)
• Fixing online services link (https://smartcookieweb.com/help/development/#web-services) (line 78)

Feel free to ignore this PR - just making you aware of the few dead links on the readme! I'm assuming this is a result of your new website - the help pages no longer exist and it doesn't look like you use php anymore :D

[CookieJarApps]

Thanks - I completely forgot to update the README after I updated the website. I'll merge this now.