Eliminate references to old extensions API

Some of these will, in the future, be replaced by the new
API but, for now, the features in question are disabled anyway.

webapp/src/components/appContent.vue

@@ -231,10 +231,6 @@ export default {
   },
 
   computed: {
-    pluginsUri: function() {
-      return `${this.$store.getters.baseUri}/api/v2/extensions`;
-    },
-
     pluginsGuiList: function() {
       // List of plugin GUIs, obtained from this.plugins values
       var pluginGuis = [];

webapp/src/components/tabContentComponents/galleryComponents/zipDownloader.vue

@@ -56,12 +56,6 @@ export default {
     };
   },
 
-  computed: {
-    pluginsUri: function() {
-      return `${this.$store.getters.baseUri}/api/v2/extensions`;
-    }
-  },
-
   mounted: function() {
     this.updateZipperUri();
   },
@@ -84,7 +78,7 @@ export default {
   methods: {
     updateZipperUri: function() {
       if (this.$store.state.available) {
-        axios
+        /*axios
           .get(this.pluginsUri) // Get a list of plugins
           .then(response => {
             var plugins = response.data;
@@ -100,7 +94,7 @@ export default {
           })
           .catch(error => {
             this.modalError(error); // Let mixin handle error
-          });
+          });*/
       } else {
         this.zipBuilderUri = null;
         this.zipGetterUri = null;

webapp/src/components/tabContentComponents/slideScanComponents/paneSlideScan.vue

@@ -134,7 +134,6 @@
 </template>
 
 <script>
-import axios from "axios";
 import taskSubmitter from "../../genericComponents/taskSubmitter";
 
 export default {
@@ -166,9 +165,6 @@ export default {
   },
 
   computed: {
-    pluginsUri: function() {
-      return `${this.$store.getters.baseUri}/api/v2/extensions`;
-    },
     currentTimeForm: {
       get() {
         // Chop the timezone information from the end
@@ -210,30 +206,7 @@ export default {
     }
   },
 
-  mounted: function() {
-    this.updateScanUri();
-  },
-
   methods: {
-    updateScanUri: function() {
-      axios
-        .get(this.pluginsUri) // Get a list of plugins
-        .then(response => {
-          var plugins = response.data;
-          var foundExtension = plugins.find(
-            e => e.title === "org.openflexure.scan"
-          );
-          // if ScanPlugin is enabled
-          if (foundExtension) {
-            // Get plugin action link
-            this.scanUri = foundExtension.links.tile.href;
-          }
-        })
-        .catch(error => {
-          this.modalError(error); // Let mixin handle error
-        });
-    },
-
     onScanError: function(error) {
       this.scanRunning = false;
       this.modalError(error);