make push-docs, make pull-docs: Point at telepresenceio/docs

[LukeShu]

Counterparts:

• https://github.com/datawire/getambassador.io/pull/1174
• https://github.com/datawire/ambassador-docs/pull/431

All of the branches in https://github.com/datawire/ambassador-docs were getting unwieldy so I created https://github.com/telepresenceio/docs for the Telepresence ones.