configuration needed for some links out

[egonw]

Great to see it online as Docker! Since I was immediately interested in looking up the details (already using a custom SPARQL enpoint, for example), I checked this:

Then I realized that the links below the table may be hardcoded:

• link to WDQS (left below table) needs configurability to point to the actual SPARQL EP used (or allowed to be hidden)
• link to the SPARQL endpoint now points to the Scholia GitHub, but these also needs to be configurable

(neither urgent, but just want to have these documented)