redundant lines removed

BS3 commit 5f3f73c
CSS docs page: backticks ==> <code>

BS3 commit ce17746
upgrade holder to 2.0, update thumbnail examples in docs to fit inside containers

BS3 commit 1555992
components docs: backticks ==> <code>. upgrade holder to 2.0, update thumbnail examples in docs to fit inside containers

BS3 commits abfcde4 and 1555992