Fix Labyrinth margins

-Should not be all round, just l/h/side
Bank station

-Labyrinth page for Bank
-Includes Central, Northern & Waterloo & City
Chesham improvements

-Change Way out to use index rather than directory
-Change header to new location
-Add Labryinth graphic to lede
-Update gallery to include Chesham pics
-Remove Facilities
-Update to global sidebar