Add sort pages by Title and by LinkTitle

Sorting can now be done on Title and on LinkTitle
Order ByTitle and ByLinkTitle added

Added documentation for new order possibilities
clearer pseudo command in quickstart doc

- previously it was ambiguous between the actual Step 1 and the "step 1" of the steps *within* Step 2 ("Clone into the hugo repository")

- also fixed a typo I guess
fix typo of readme
Add www.heyitsalex.net to Community Showcase.
Optimizing thumbnail & preview images
Add Tutorial With Steps to Migrate from Jekyll.
Fixes #227 by properly scoping the variables within the go routine.