Fix up other external links

The other links were intended to be externally opening links (as
evidenced by the `rel` attribute on them) but the `target="_blank"` bit
was missing on some of them. All have been updated to use the AExt
component.

client/src/components/AboutDialog.vue

@@ -27,11 +27,9 @@
       <v-card-text
         class="px-4 pt-4 pb-1"
         >
-        Multinet is a system for storing and processing <a
-          href="https://vdl.sci.utah.edu/mvnv/" rel="noopener
-          noreferrer">multivariate networks</a>. Learn more and explore the code
-        at <a href="https://github.com/multinet-app/multinet" rel="noopener
-          noreferrer">GitHub</a>.
+        Multinet is a system for storing and processing <a-ext
+          href="https://vdl.sci.utah.edu/mvnv/">multivariate networks</a-ext>. Learn more and explore the code
+        at <a-ext href="https://github.com/multinet-app/multinet">GitHub</a-ext>.
       </v-card-text>
 
       <v-card-text class="px-4 pt-4 pb-1">
@@ -45,7 +43,7 @@
         class="px-4 pt-4 pb-1"
         >
         This instance of Multinet was built from Git SHA
-        <a :href="gitShaURL" target="_blank" rel="noopener noreferrer">{{gitSha.slice(0, 6)}}</a>.
+        <a-ext :href="gitShaURL">{{gitSha.slice(0, 6)}}</a-ext>.
       </v-card-text>
 
       <v-divider />