[SPARK-8353] [DOCS] Show anchor links when hovering over documentation headers#6808

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JoshRosen wants to merge 3 commits intoapache:masterfrom

JoshRosen:SPARK-8353

Commits on Jun 13, 2015

Add anchor links when hovering over headers; remove some dead JS code
JoshRosen
committed

Commits on Jun 14, 2015

Turn on for all headers, since we use H1s in a bunch of places
JoshRosen
committed

Commits on Jun 18, 2015

Suppress underline on hover
JoshRosen
committed