Fix chart axis labels and external data

chart.json

@@ -12,13 +12,13 @@
     "data": {
       "changes": [
         {
-          "column": 7,
+          "column": 5,
           "ignored": false,
           "row": 0,
           "value": "date"
         },
         {
-          "column": 9,
+          "column": 7,
           "ignored": false,
           "row": 0,
           "value": "time per km (sec)"
@@ -58,9 +58,11 @@
           "type": "text"
         }
       },
+      "external-data": "https://lab.saloun.cz/jakub/running-data/raw/branch/master/tempelhof.csv",
       "horizontal-header": true,
       "transpose": false,
-      "upload-method": "copy",
+      "upload-method": "external-data",
+      "use-datawrapper-cdn": true,
       "vertical-header": true
     },
     "describe": {
@@ -71,7 +73,7 @@
           "name": "date_parsed"
         },
         {
-          "formula": "NUMBER(SUBSTR(time, 0, 2)) * 60 + NUMBER(SUBSTR(time, 3, 5)) + NUMBER(SUBSTR(time, 6, 8)) * 0.01",
+          "formula": "NUMBER(SUBSTR(time, 0, 2)) * 60 + NUMBER(SUBSTR(time, 3, 2)) + NUMBER(SUBSTR(time, 6, 2)) * 0.01",
           "name": "time_sec"
         },
         {