Embed report summary

[tegioz]

Projects can now embed a summary of the score report in their README files, websites, etc. The embed code can be obtained from the project's page, by clicking on the menu icon on the top right corner.

The code is available in markdown, asciidoc and html formats, with two themes to choose from: light and dark. The summary report is rendered as an SVG image that displays the project's global score as well as each of the sections'.