For each concept, be able to associate a portal

[iryna1]

Jean-Marc, you can provide substeps if you want to decompose this big issue.

[jmsevin]

As FR Wikipedia seems to be the best version for portals, we'll use it as starting point.

• [x] Generate ordered list of FR Wikipedia portals
• [x] Generate dataset linking concepts (Wikipedia pages) to portals
• [x] Import portals into Neo4j database
• [x] Link Concept nodes to Portal nodes
• [x] Compute Portal nodes locations
• [x] Write API to get concept(s) in a selected portal
• [x] Write API to get portal(s) for a selected concept

[jmsevin]

Both APIs need the Neo4j database with the new schema, which explains the delay for solving this issue.

[jmsevin]

Waiting for code review.