fix: use existing labels in issue templates (fixes #249)

.github/ISSUE_TEMPLATE/add-competition.yml

@@ -1,7 +1,7 @@
 name: Add a competition
 description: Suggest a student competition for the catalog. A citation and a quality check are required.
 title: "[competition] "
-labels: ["competition"]
+labels: ["data", "competitions"]
 body:
   - type: markdown
     attributes:

.github/ISSUE_TEMPLATE/add-place.yml

@@ -1,7 +1,7 @@
 name: Add a public place
 description: Suggest a student place for the map. A citation and a quality check are required.
 title: "[place] "
-labels: ["place"]
+labels: ["data"]
 body:
   - type: markdown
     attributes:

.github/ISSUE_TEMPLATE/verify-place.yml

@@ -1,7 +1,7 @@
 name: Verify a place
 description: Re-check an existing place on the map (address, entrance, open status). A smaller ask than adding a new place.
 title: "[verify] "
-labels: ["verification"]
+labels: ["data"]
 body:
   - type: markdown
     attributes: