[openstreetmap/openstreetmap-website] Add Communities page (#3301)

[Andy Allan]

@gravitystorm commented on this pull request.



> +    end
+
+    def self.init_local_chapters
+      raw_local_chapters = load_raw_local_chapters
+      local_chapters = []
+      raw_local_chapters.each do |chapter|
+        id = chapter[:id]
+        url = chapter[:resource]["strings"]["url"]
+        local_chapters.push(LocalChapter.new(id, url))
+      end
+      local_chapters
+    end
+
+    def self.load_raw_local_chapters
+      community_index = OsmCommunityIndex.community_index
+      raw_local_chapters = []

`map ... .compact` rather than `foo = [] ... each ... unless x; foo.push(bar)` to make this easier to read. Or if we were on ruby 2.7+ (which we aren't yet) we could use [`Enumerable.filter_map`](https://blog.saeloun.com/2019/05/25/ruby-2-7-enumerable-filter-map.html)

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