FLUDI-4740: Removes support for building WAR files with Maven from the Infusion build system.
Merge branch 'master' into FLUID-4740
FLUID-4740: Removed webapp/ directory.
FLUID-4740: Removed the mentioning of maven, fixed the wiki page for "infusion custom build" and restored the links to the ancient code with "webapp/" in place.
FLUID-4740: Fixed the relative path to "build-scripts" directory.
Merge remote-tracking branch 'cindyli/FLUID-4740'

* cindyli/FLUID-4740:
  FLUID-4740: Fixed the relative path to "build-scripts" directory.
  FLUID-4740: Removed the mentioning of maven, fixed the wiki page for "infusion custom build" and restored the links to the ancient code with "webapp/" in place.
  FLUID-4740: Removed webapp/ directory.
  FLUDI-4740: Removes support for building WAR files with Maven from the Infusion build system.