Change title 'Lightweight Activities' on home page to 'Activities'.
Change title 'Lightweight Activities' on home page to 'Activities'.

[#47150075]
As per https://www.pivotaltracker.com/story/show/47150075

Change lightweight authoring url from lightweight-mw.concord.org to authoring.concord.org, and change title that says 'Lightweight Activities' on the home page to 'Activities'.

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