Fixes navbar overlap on in-page link jumps (#746)
Fixes navbar overlap on in-page link jumps (#746)

* Fixes header overlap on in-page link jumps
* Cleans up the unused CSS

tensorflow/tfjs,tensorflow/tfjs-core,tensorflow/tfjs,tensorflow/tfjs,tensorflow/tfjs-core,tensorflow/tfjs-core,tensorflow/tfjs,tensorflow/tfjs-core,tensorflow/tfjs,tensorflow/tfjs,tensorflow/tfjs-core,tensorflow/tfjs,tensorflow/tfjs,tensorflow/tfjs,tensorflow/tfjs-core