help: Remove old docbook help
help: Add index.page

Also adds logo images, legal.xml and Makefile.am
help: Add rules.page

Also add Makefile.am entry
help: Add puzzles.page

Also adds Makefile.am entry
help: Add start-game.page

Also adds Makefile.am entry
help: Add scores.page

Also adds Makefile.am entry
help: Add puzzles-moves.page

Also adds Makefile.am entry
help: Add moves.page

Also adds Makefile.am entry
help: Add game-introduction page

Add Makefile.am entry
Move description from index.page to game-introduction.page
help: Add keyboard shortcuts page

Also adds Makefile.am entry
Review commits

Work on each page by removing my review comments and fixing as asked.
Commit a single page in each commit.
Merge branch 'mallard-help' of https://github.com/sindhus/gnome-klotski into mallard-help
help: rephrased the description, fixed the introduction link in index.page
help: removed game-introduction.page
help: changed name from game-introduction to introduction, updated the description
help: merged puzzle-moves.page with puzzles.page
help: add minimum-number-of-moves section to puzzles.page
help: rephrased the steps in scores.page
help: rename shortcuts.page to keyboard-shortcuts.page
help: break the first sentence in the 'patterend-block-moves' section into two sentences in moves.page