add initial flashing of batery and 3.1 adjustments

rust/src/webserver/config.html

@@ -17,8 +17,9 @@
     <p id="loaded_n_total"></p>
   </form>
 
-
-
+  <h2>Battery Firmeware (bq34z100 may be R2)</h2>
+  <button id="flash5ah12vlifepo">Flash 6AH 12V Lifepo replacement (built in)</button>
+  <div style="height: 100px; display: block; overflow-y: auto;" id = "flash_message"></div>
   <h2>config</h2>
 
   <div id="configform">