Refresh EF 5 with MVC tutorial series (#8868)
* first updates
* completed first article in tutorial series; updated screenshots and links; acrolinx
* tutorial updates
* add xref query tags to config.json file; fix enums
* fix broken xref
* update intro note and delete refs to download PDF
* completes refresh of crud topic
* remove 2013 from vs 2013 intro
* remove user voice link
* add numbering
* acrolinx; completed sorting topic
* minor formatting changes
* complete refresh of migrations topic, including new screenshots
* acrolinx
* delete unused images
* fix broken links
* fix broken links; add numbered steps
* fix broken links
* fix broken link
* review on staging
* reset file in different folder
* revise use of blade
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