v4 - Fix broken link in Sass mixins section of v4 docs

v4 - Use border-radius mixin in form-control-sm and form-control-lg

v4 - Add new table functionality to table migration section

v4 - Remove weird extra border from GitHub follow buttons on v4 Team page

Fix #17175

X-Ref Original Against Wrong Branch: #17179

Calls out the new `.table-inverse`, `.table-reflow`, `.thead-default` and `.thead-inverse`

Fix #17177

Simplest example is using horizontal variants using rows.

Otherwise the "Heads up!" is at the end of the previous line, making the connection to the warning unclear.

Mostly links.
Fixes #17056.

Fixes #17096

Title on Figures page should be Figures and not Images?

Fixes #17028
Closes #17042

Fix link to .table section in Reboot

v4 - Fix urls ./helpers => ./utilities

v4 - Fix text utilities link

fix broken link to flexbox

Docs: Update all dropdowns to new HTML structure

v4 Docs - Fix scroll spy navbar example

Update shrinkwrap to help fix Travis build

Example:
> ... SCSS variables (e.g., `@enable-gradients: true`) ...
Referenced SCSS but used the LESS syntax. Changed to:
> ... SCSS variables (e.g., `$enable-gradients: true`) ...

Closes #17114

Fix #17160

Fix #17125

v4 - Fix container option example code

v4 Docs - Fix tether typo

Fix tether typo

Remove btn-xs from dropdown docs