Add support for table caption

Provides styling of table caption element
Provides more configuration of side nav

Adds a few more variables to configure headings and link hover background
js init function updated
Allow controlling heading sizes on small screens

Introduced variables $h1-font-reduction etc to allow customizing font sizes on mobile separately without overriding them in a custom stylesheet.
Merge pull request #5170 from danielck/master

Allow controlling heading sizes on small screens, fixes #5169
Merge pull request #5033 from clyates/patch-5

Provides more configuration of side nav
Merge pull request #5032 from clyates/patch-4

Add support for table caption
adfix for overriding styles on subheader
undo PR 5128 as it was a breakig chnage
Adding Data-Offcanvas for Docs page
Updating deployer
Merge pull request #5112 from unclediluvian/mybranch

js init function updated
adadds documentation for block grid variable
Anchored image breaks timer - bugfix 

If the slider image is wrapped in an anchor tag the timer never starts because line 278 was looking for a direct child image. changed to .find('img') to locate inner images
Merge pull request #5189 from codymorgan/patch-1

Orbit anchored image breaks timer - bugfix
Fix sidebar in docs