feat: add PR-329 video

Author: kkweon

server/internal/data/mapping_table.pbtxt

@@ -2437,3 +2437,10 @@ rows: {
   paper_arxiv_ids: "2011.06409"
   youtube_video_id: "rtuJqQDWmIA"
 }
+rows: {
+  pr_id: 329
+  paper_arxiv_ids: "2106.14881"
+  paper_arxiv_ids: "2106.14881"
+  paper_arxiv_ids: "2105.01601"
+  youtube_video_id: "NicKVB-rpc8"
+}