Parameterize @breadcrumb-separator

BS3 commit eb95574d8001591d1e056fcaeaf59138cbbb15a4
Getting started docs: tweaks to the _Basic template_ section

BS3 commit 5c3614d97c869a6b928a50ffbdeb4e291aeaf53a
'Getting started' section: refactoring for succinctness, active voice, and consistency with button and link captions.

BS3 commit 8f80a76bf302c7724584da62a5851f1cce2cdb5d
fixes 10136

BS3 commit 9e541fc717fdaa333bde760688dc6a16256e607d
fixes 10153: restore headings-color variable

BS3 commit 794d7845199d46b89f45026d47091e6f30de73a2
fixes 10223: adds color to input addon

BS3 commit 4b53ea52e9cc27ab27dde2695400fd6c95a0b6c2
use direct-child selector more in table styles to better support nested tables

BS3 commit 1e68143b39d51dcdbde575120628053c1e3ae966
finishes #10245 by adding it the new var to the customizer

BS3 commit e10bf3aa7ffc8a6544d0fff89196e5876d0fc600
better layout

BS3 commit 3a4ea1a7bea5a8400672c7e6a47f71b5ea2ee749
fixes 10246: Use correct variable for link hover color in Customizer

BS3 commit dfda3dfe3727fdd292d73cb7d9de5699527e3216
Update index.html (update text from hero unit to jumbotron)

BS3 commit c9303c17abc0f2f0c488d2bdd3b1e8d3f8a56b10
finishes 10256 to add updated var to customizer; also fixes another old var

BS3 commit 58401daf1c6d97301af707045f8e1f0651e7290b
remove unused link from navs section

BS3 commit 9616768659010979cd20f587791e966be38868d8
Note the change to the progress bar.

BS3 commit 2066ea50a28119f3f890b84cabeb9214a346a1b5
fix straggler instance of "Tiny grid" terminology

BS3 commit 93694898838b479d2806c53c827847f724312bcc
BS3: missed commit
fixes 10153: restore headings-color variable. fixes 10223: adds color to input addon. use direct-child selector more in table styles to better support nested tables

BS3 commits 794d7845199d46b89f45026d47091e6f30de73a2,
4b53ea52e9cc27ab27dde2695400fd6c95a0b6c2,
1e68143b39d51dcdbde575120628053c1e3ae966