Revert "Revert "#166: Fixed heading styles""

This reverts commit 230c336e4d1108f44c6682f3446f527c5cec5311.
Revert "Revert "169: Less whitespace""

This reverts commit c712bce99e64537b0508d3fcddfa4df8114873f2.
Revert "Revert "#167: Align search & browse headings""

This reverts commit 40313d2d2cbfa14b178acd475f33666f9c2fbca5.
Revert "Revert "#170: Breadcrumb links & style""

This reverts commit 2460e75a37410460f0a40b587cf68094430e567a.