Fix typo on homepage

environemnt -> environment
Properly capitalize "WordPress"

As per the preferred way of .org, using "WordPress" instead of "Wordpress". There were just a few to fix, some were already correct.
Lowercase WordPress folder name

To correspond with how the generated folder is actually named, it needs to be "wordpress" not "WordPress".
Merge pull request #60 from lchski/gh-pages

Fix typos on homepage