feat: add link to API docs

frontend/src/routes/settings/+layout.svelte

@@ -79,7 +79,7 @@
           active={$page.url.pathname === "/settings/tokens"}
           href="/settings/tokens"
         >
-          Tokens
+          API tokens
         </ListGroupItem>
         <ListGroupItem
           tag="a"

frontend/src/routes/settings/tokens/+page.svelte

@@ -46,10 +46,11 @@
 </script>
 
 <h1>
-  Tokens ({data.tokens.length})
+  API tokens ({data.tokens.length})
   <ButtonGroup>
     <Button color="success" on:click={() => createToken(false)}>New API token</Button>
     <Button color="success" on:click={() => createToken(true)}>New read-only API token</Button>
+    <Button color="secondary" href="/api" target="_blank">API docs</Button>
   </ButtonGroup>
 </h1>