[IMP]: implement category view and draft template
[FIX]: fix to get the related slides based on category instead of tags
[IMP]: change bgcolor mouse hover for mostview items in less file.
[imp] website_slides: optimize embed view for pdfviewer
[IMP] fetch index content from pdfjs
[FIX]: refactor code to implement category properly
[IMP]: improve channel mail view and category view
[FIX]: improve view for promote
[IMP]: implement basic search function
[FIX]: small fix for embeded viewer
[ADD] website_slides: added demo data and related files(images for infographic and PDFs for presentations and document)