chore demo: add simple icons demo
chore demo: enhance icons documentation
refactor icons: use common size variables
chore demo: enhance lists layout
chore demo: cleaner cards hljs
chore demo: cleaner checkboxes hljs
chore demo: fix buttons file name
chore demo: cleaner radio buttons hljs
chore demo: cleaner switched hljs
refactor checkbox: use size variable
refactor radio button: use size variable
fix toolbar: floating elements in left/right areas
chore demo: implement search filter in toolbar
chore demo: include comment in fab hljs
chore demo: enhance dropdowns doc
fix tabs: panes padding
chore demo: cleaner tabs hljs
chore demo: fix highlightjs directive

Fix first break line bug. Move highlightjs directive in demo vendors
folder.
chore demo: update dropdowns hljs
chore demo: update tabs hljs