Hide fields that leads to consuming requests in Django admin

Closes #30

backend/metagenedb/apps/catalog/admin/gene.py

@@ -5,6 +5,7 @@ from metagenedb.apps.catalog.models import Gene
 
 @admin.register(Gene)
 class GeneAdmin(admin.ModelAdmin):
+    exclude = ('functions', 'taxonomy')
 
     list_display = ('gene_id', 'name', 'length', 'get_functions', 'get_taxonomy')
     search_fields = ('name',)