docs: redirect root pages to the latest version
Like /about/
to 4.2/about/
etc.
Here's the list
about
browser-bugs
components
css
customize
examples
blog
carousel
cover
dashboard
grid
jumbotron
jumbotron-narrow
justified-nav
navbar
navbar-fixed-top
navbar-static-top
non-responsive
offcanvas
signin
starter-template
sticky-footer
sticky-footer-navbar
theme
tooltip-viewport
getting-started
javascript
migration -> to /docs/3.4/migration/ ?