chore: Update syntax, improve more typing (#1439)

* chore: <React.Fragment> to <>

* flow types

app/components/Sidebar/components/Collections.js

@@ -55,7 +55,7 @@ class Collections extends React.Component<Props> {
     const { collections, ui, documents } = this.props;
 
     const content = (
-      <React.Fragment>
+      <>
         {collections.orderedData.map((collection) => (
           <CollectionLink
             key={collection.id}
@@ -73,7 +73,7 @@ class Collections extends React.Component<Props> {
           label="New collection…"
           exact
         />
-      </React.Fragment>
+      </>
     );
 
     return (

app/components/Sidebar/components/Version.js

@@ -30,7 +30,7 @@ export default function Version() {
     <SidebarLink
       href="https://github.com/outline/outline/releases"
       label={
-        <React.Fragment>
+        <>
           v{version}
           <br />
           <LilBadge>
@@ -40,7 +40,7 @@ export default function Version() {
                   releasesBehind === 1 ? "" : "s"
                 } behind`}
           </LilBadge>
-        </React.Fragment>
+        </>
       }
     />
   );