Add FDP roadmap section to landing page

[crtahlin]

From email thread, quote:

a "fdp roadmap section" somewhere which highlights what has been done and where we are

• something like this maybe on the main page at the bottom - https://raw.githubusercontent.com/fairDataSociety/FIPs/master/resources/roadmap-milestones-flowchart.png

We can link to the whole diagram, to open it up maximized (just showing on the page in a section, will not be legible. But the section should also have IMO a part:

• working on (listing in bullets what is currently in progress)

• next items (listing in bullets e.g. next 5 items to be worked on from the roadmap)

• create content for Roadmap section, specifically, "working on" and "next items"

• put content on the FDP landing page

[crtahlin]

@nugaon can you tackle creating the mentioned content bullet above?