Make it clear that local files are never uploaded to a remove server

src/HelpPage.tsx

@@ -58,13 +58,23 @@ function HelpPage() {
       <section>
         <h2>Opening local files</h2>
         <p>
-          myHDF5 supports opening local HDF5 files of any size, either by
-          selecting them via a file picker from the{' '}
+          myHDF5 supports opening local HDF5 files of <strong>any size</strong>,
+          either by selecting them via a file picker from the{' '}
           <Link to="/">
             <em>Open HDF5</em>
           </Link>{' '}
           page, or by dragging and dropping them anywhere on the interface at
-          any time. You can even select/drop multiple files at once.
+          any time. You can even select/drop multiple files at once. Note that
+          your files are <strong>never uploaded</strong> to a remote server;
+          everything happens locally in your browser thanks to{' '}
+          <a
+            href="https://github.com/usnistgov/h5wasm"
+            target="_blank"
+            rel="noreferrer"
+          >
+            h5wasm
+          </a>
+          .
         </p>
       </section>
       <section id="remote">

src/services/LocalService.module.css

@@ -7,4 +7,5 @@
 
 .hint {
   composes: hint from '../utils.module.css';
+  max-width: 40em;
 }

src/services/LocalService.tsx

@@ -16,7 +16,18 @@ function LocalService() {
       >
         Select HDF5 files
       </button>
-      <p className={styles.hint}>or drop files anywhere at any time</p>
+      <p className={styles.hint}>
+        ... or drop files anywhere at any time. Your files won't be uploaded to
+        a remote server; everything happens locally in your browser thanks to{' '}
+        <a
+          href="https://github.com/usnistgov/h5wasm"
+          target="_blank"
+          rel="noreferrer"
+        >
+          h5wasm
+        </a>
+        .
+      </p>
     </Service>
   );
 }

src/services/RemoteService.module.css

@@ -21,5 +21,5 @@
 
 .hint {
   composes: hint from '../utils.module.css';
-  max-width: 45em;
+  max-width: 40em;
 }