draft: deduplicate C-of-C; extend CONTRIBUTING #248
      
        
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CONDUCT.md was based on a conduct covenant that predated that for code_of_conduct.md, so we removed CONDUCT.md
References to issues board have been fixed. `In a github markdown:
issues/newdirects torepo/blob/main/issues/new(a code file; not what you want)/issues/newdirects torepo/issues/new(the new issues form).