Show a raw version of the feeds

[Xpirix]

• This PR is addressing the following issue: #58

Currently, the result of the request on the root URL depends on the agent, i.e it returns a raw json if the request is made from qgis and a web page if it's from a browser. This PR proposes to show both the preview and the raw json on the home web page.

Changes summary

• Implement highlight.js
• Add tabs Preview for the feeds preview and Raw for the feeds JSON raw view

Requirement

• These changes require a build on the server side

Please find below a screenshot of the raw view on the home page:

[haubourg]

Nice! I expected only a link to the url with the feed, you did a lot more !

Thanks ! LGTM

[Xpirix]

You're welcome.

[Xpirix]

This PR has been deployed