re-labeled button as Passthrough

NoReset is on/off is confusion as a double negative. Renamed with a bit of explanation to help navigation. Passthrough mode is disabled by default.

index.html

@@ -62,8 +62,7 @@
       <div class="subheader">
         <div class="title left">Adafruit ESPTool</div>
         <div class="right">
-          <!-- New No Reset Toggle -->
-          <label for="noReset"> Connect without Reset </label>
+          <label for="noReset"> Turn on for Passthrough updates</label>
           <div class="onoffswitch" style="margin-right: 30px;">
             <input
               type="checkbox"