produce cleaner markdown from readme

[stavros-k]

Problem:

Markdown (and html) ignores single new lines.
To make it easier to layout long paragraphs in multiple lines
But when we convert md to html and them to json, those new lines are encoded in to the string and UI will actually render the new line.

If we take the output markdown.markdown and directly write it to html, it will display correctly (ignoring single new lines).
But because we then place it in a json which encodes the new lines in, then the output displays the new lines

Solution:

Replace the \n to . This makes the UI render correctly the README, without developer having to constantly think how to write the readme files.

More context:
https://ixsystems.atlassian.net/jira/software/c/projects/TNCHARTS/issues/TNCHARTS-1305