Let the axis and genes container be handled in genome-browser component

src/index.html

@@ -5,13 +5,7 @@
         <button type="button" id="zoom-in">+</button>
         <button type="button" id="zoom-out">-</button>
     </div>
-    <svg>
-        <g id="genome-browser">
-            <g id="axis"></g>
-            <g id="genes"></g>
-        </g>
-
-    </svg>
+    <svg></svg>
     <script src="./scripts/index.ts"></script>
 </body>