Remove jekyll header from readme

It confuses Slate
Merge pull request #2406 from bootstraponline/master

Remove jekyll header from readme
Update links to pass lint
Merge pull request #2408 from bootstraponline/master

Update links to pass lint
Run appium_doc_lint on Travis CI
Update links to work with Slack
Use relative links in the readme
Merge pull request #2409 from bootstraponline/master

Run appium_doc_lint on Travis CI
Fix links
Merge pull request #2414 from bootstraponline/master

Fix links
Fix getting started link
Merge pull request #2416 from bootstraponline/master

Fix getting started link
Fix real devices link
Fix docs/cn/ links
Merge pull request #2419 from bootstraponline/master

Fix doc links
Fix code links
Merge pull request #2421 from bootstraponline/master

Fix code links
Quotes have a special meaning in Slate

They appear in the code section
Fix more broken links
Merge pull request #2422 from bootstraponline/master

Prefer linking direct to doc