Github examples, SSH vs HTTPS links

Related issue: https://github.com/couchbase/docs-sdk-nodejs/pull/70

Our Github examples expect that users have configured their public SSH keys in Github. If a user doesn't have public SSH key configured, they'll run into problems executing the following command:

git clone git@github.com:couchbaselabs/try-cb-nodejs.git
===
Cloning into 'try-cb-nodejs'...
git@github.com: Permission denied (publickey).
fatal: Could not read from remote repository.

Please make sure you have the correct access rights
and the repository exists.
===

We may want to give the alternative HTTPS link, e.g.:

git clone https://github.com/couchbaselabs/try-cb-nodejs.git

This change will probably affect other documentation pages with "git clone" commands.

Reporter: Oleg Kuzmin
E-mail: oleg.kuzmin@couchbase.com