example.bashrc: handle also /etc/bash.bashrc (Debian/Ubuntu)
examples.bashrc: add the interactive shell guard (#291)

https://github.com/nojhan/liquidprompt/issues/291
example.bashrc: remove wrong advice in comments

Wrong advice about how the liquidpromptrc is loaded.
example.bashrc: be consistent with README about liquidprompt path

Consistency with README about the liquidprompt installation path.
Merge branch 'fix/example.bashrc' into develop

Fix example.bashrc
CHANGES: update for changes in examples.bashrc