Improve tinymce links/images modals + improved autotoc docs

AutoTOC
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* Include example on how to render tabs
* Improve tabs setup using "autotabs" class on pattern element

TinyMCE
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* Improve markup and styles for link modal and image modal
* Use AutoTOC to display main options as tabs
* Splitted link and image js upload template
* Fix less/css loading (include autotoc styles)