Adds AnchorJS in site footer to create linkable anchors on every heading.
Adds AnchorJS in site footer to create linkable anchors on every heading.

Fixes #1423

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MOS_MIGRATED_REVID=125445881

mikelalcon/bazel,ButterflyNetwork/bazel,dropbox/bazel,mikelikespie/bazel,aehlig/bazel,variac/bazel,dslomov/bazel-windows,twitter-forks/bazel,abergmeier-dsfishlabs/bazel,perezd/bazel,ulfjack/bazel,aehlig/bazel,twitter-forks/bazel,mbrukman/bazel,ButterflyNetwork/bazel,UrbanCompass/bazel,mrdomino/bazel,cushon/bazel,hermione521/bazel,kchodorow/bazel,akira-baruah/bazel,juhalindfors/bazel-patches,ulfjack/bazel,mikelikespie/bazel,iamthearm/bazel,spxtr/bazel,variac/bazel,kchodorow/bazel-1,davidzchen/bazel,safarmer/bazel,dslomov/bazel,dslomov/bazel-windows,damienmg/bazel,aehlig/bazel,dslomov/bazel-windows,meteorcloudy/bazel,werkt/bazel,werkt/bazel,spxtr/bazel,werkt/bazel,aehlig/bazel,bazelbuild/bazel,akira-baruah/bazel,aehlig/bazel,damienmg/bazel,katre/bazel,damienmg/bazel,snnn/bazel,ulfjack/bazel,mbrukman/bazel,mbrukman/bazel,zhexuany/bazel,UrbanCompass/bazel,zhexuany/bazel,iamthearm/bazel,werkt/bazel,davidzchen/bazel,UrbanCompass/bazel,akira-baruah/bazel,dropbox/bazel,UrbanCompass/bazel,zhexuany/bazel,snnn/bazel,dropbox/bazel,abergmeier-dsfishlabs/bazel,bazelbuild/bazel,meteorcloudy/bazel,meteorcloudy/bazel,katre/bazel,abergmeier-dsfishlabs/bazel,abergmeier-dsfishlabs/bazel,hermione521/bazel,hermione521/bazel,mikelalcon/bazel,davidzchen/bazel,ulfjack/bazel,spxtr/bazel,dslomov/bazel,mikelikespie/bazel,zhexuany/bazel,Asana/bazel,mbrukman/bazel,davidzchen/bazel,kchodorow/bazel,kchodorow/bazel-1,snnn/bazel,variac/bazel,safarmer/bazel,LuminateWireless/bazel,dslomov/bazel,hermione521/bazel,dslomov/bazel-windows,aehlig/bazel,spxtr/bazel,cushon/bazel,ButterflyNetwork/bazel,Asana/bazel,mikelalcon/bazel,mikelikespie/bazel,juhalindfors/bazel-patches,LuminateWireless/bazel,dslomov/bazel,mikelikespie/bazel,abergmeier-dsfishlabs/bazel,katre/bazel,meteorcloudy/bazel,Asana/bazel,abergmeier-dsfishlabs/bazel,davidzchen/bazel,variac/bazel,perezd/bazel,ulfjack/bazel,twitter-forks/bazel,ButterflyNetwork/bazel,dslomov/bazel-windows,bazelbuild/bazel,aehlig/bazel,UrbanCompass/bazel,dropbox/bazel,twitter-forks/bazel,perezd/bazel,bazelbuild/bazel,mrdomino/bazel,ButterflyNetwork/bazel,werkt/bazel,werkt/bazel,kchodorow/bazel,safarmer/bazel,damienmg/bazel,snnn/bazel,variac/bazel,safarmer/bazel,cushon/bazel,twitter-forks/bazel,mrdomino/bazel,kchodorow/bazel,akira-baruah/bazel,bazelbuild/bazel,kchodorow/bazel-1,katre/bazel,juhalindfors/bazel-patches,twitter-forks/bazel,cushon/bazel,meteorcloudy/bazel,kchodorow/bazel-1,damienmg/bazel,safarmer/bazel,perezd/bazel,davidzchen/bazel,cushon/bazel,ulfjack/bazel,juhalindfors/bazel-patches,mrdomino/bazel,twitter-forks/bazel,juhalindfors/bazel-patches,kchodorow/bazel-1,safarmer/bazel,perezd/bazel,LuminateWireless/bazel,mbrukman/bazel,spxtr/bazel,variac/bazel,akira-baruah/bazel,LuminateWireless/bazel,damienmg/bazel,damienmg/bazel,akira-baruah/bazel,snnn/bazel,Asana/bazel,Asana/bazel,kchodorow/bazel,iamthearm/bazel,davidzchen/bazel,snnn/bazel,spxtr/bazel,variac/bazel,mikelalcon/bazel,spxtr/bazel,dropbox/bazel,dropbox/bazel,iamthearm/bazel,juhalindfors/bazel-patches,Asana/bazel,bazelbuild/bazel,perezd/bazel,mrdomino/bazel,zhexuany/bazel,katre/bazel,snnn/bazel,meteorcloudy/bazel,hermione521/bazel,dslomov/bazel,iamthearm/bazel,ButterflyNetwork/bazel,juhalindfors/bazel-patches,hermione521/bazel,iamthearm/bazel,dslomov/bazel-windows,dslomov/bazel,perezd/bazel,zhexuany/bazel,mikelalcon/bazel,kchodorow/bazel-1,katre/bazel,Asana/bazel,mikelalcon/bazel,mikelikespie/bazel,LuminateWireless/bazel,LuminateWireless/bazel,meteorcloudy/bazel,UrbanCompass/bazel,cushon/bazel,kchodorow/bazel,mrdomino/bazel,ulfjack/bazel,kchodorow/bazel,dslomov/bazel,mbrukman/bazel