[atlas] Easier access to bandwidth data of RIPE Atlas anchors

Dear RIPE Atlas community,

we have added a small feature to the listing of RIPE Atlas anchors:
https://atlas.ripe.net/anchors/list/

If you click on the hostname of the anchor (e.g. nl-ams-as3333),
the link will take you to the graph of bandwidth, served by RIPEstat:
https://stat.ripe.net/m/widget/atlas-probe-traffic#w.probe_id=6001&w.measurement_id=1008&w.mode=condensed

This is the same graph that appears on the RIPE Atlas "probe page"
of every anchor, but we decided to add a direct link to the bandwidth 
graph rather then to the whole probe page, since we are working on the 
improved version of it.

The graph is zoomable, so you can see the whole year of data for older 
anchors; and it has other features described in this RIPE Labs article: 
https://labs.ripe.net/Members/becha/seismograph-and-other-new-ripe-atlas-features/#zoom-ping

Hosts of RIPE Atlas anchors can access the same feature via their
admin interface.

Other features on this "list" page of RIPE Atlas anchors are:
- sortable columns: you can sort by hostname, company name, city
or country; in ascending and descending order
- "clickable" links to anchoring measurement per anchor, per type

We hope that this will give you more insight into the operations
of RIPE Atlas anchors to date.

We are still accepting applications from new hosts:
https://atlas.ripe.net/get-involved/become-an-anchor-host/

Regards,
Vesna