mailto obfuscation and meta tags tailored for each page

Used email obfuscator from http://www.albionresearch.com/misc/obfuscator.php, selecting the javascript option, in response to request from badminton wycombe web site manager. SEO meta tagging advice from http://www.degalseo.co.uk/metatags.html. Added meta tags to each page, using terms reflecting the different content of each page. Have not yet applied any titles to alt text to links, which is recommended.
Very minor change: title of coaches page and moved private_readme.md

This version put live tonight.