JQuery CDN, Bugfixes, Mobile UI improvements

Desktop site now pulls in JQuery from a CDN.

Desktop site's photo-slider bugfixes
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* Updated the default style,
* Removed the text-based link to Next Slide,
* Fixed resizing issues,
* Now uses start() instead of init(),
* Commented out the hard-coded photo widths,
* Replaced the use of IDs with class', since there should not be more
than 1 ID in a document.

Mobile site UI improvements
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* Added images to the Projects and Services buttons
* Replaced text-based links with Left/Right arrows images to manually
control the photo slider