changed url format
unique welcome doc (by using id = "welcome"). fixes #166.
Merge branch 'gh-pages' of github.com:litewrite/litewrite into gh-pages

# By Jan-Christoph Borchardt
# Via Jan-Christoph Borchardt
* 'gh-pages' of github.com:litewrite/litewrite:
  correct min-height of text area to prevent scrollbar because of new modified date on bottom