Update links on README and general copyedits [ci skip]

- Should be called "Simplified Chinese" in language list
- Change link to clone Publify to use the HTTPS version
  as the git link does not generate a link under Markdown
- Basic theme list should only list three items, the extra
  bit about screenshots serves better, neater as addendum.
- Link to FAQ hosted on GitHub wiki has moved
Merge pull request #244 from randomecho/copyedit-readme201309

Update links on README and general copyedits