Added cheesecake_recipe.html
Revert "Added cheesecake_recipe.html"

This reverts commit 95ea587dad89401d1498af71d0fe3c5eeee9d296.
Added cheesecake_recipe.html
Added element_definitions.html
Merge branch 'gh-pages'
Merge branch 'gh-pages'
finished; moved paragraph end tags
Merge branch 'gh-pages'
added folder Lab 3 and image_optimization.html
Added all basic element tags to the html
added images and put image sources into html
added all attribute values
added headers
finished image_optimization.html; added paragraph content
Merge branch 'master' into gh-pages