chore(gnoweb): update link to the docs (#1753)

## Description

This PR updates the "Start" button at the navbar to lead to the Local
setup section in the docs. The reason for this is that the link has had
a change in a previous PR and doesn't take the user to where it was
intended - with this PR that is fixed.

<details><summary>Contributors' checklist...</summary>

- [x] Added new tests, or not needed, or not feasible
- [x] Provided an example (e.g. screenshot) to aid review or the PR is
self-explanatory
- [x] Updated the official documentation or not needed
- [x] No breaking changes were made, or a `BREAKING CHANGE: xxx` message
was included in the description
- [x] Added references to related issues and PRs
- [x] Provided any useful hints for running manual tests
- [ ] Added new benchmarks to [generated
graphs](https://gnoland.github.io/benchmarks), if any. More info
[here](https://github.com/gnolang/gno/blob/master/.benchmarks/README.md).
</details>

gno.land/pkg/gnoweb/views/funcs.html

@@ -13,7 +13,7 @@
         <ul>
           <li><a href="/about">About</a></li>
           <li><a href="/blog">Blog</a></li>
-          <li><a href="https://docs.gno.land/getting-started">Start</a></li>
+          <li><a href="https://docs.gno.land/getting-started/local-setup">Start</a></li>
           <li><a href="/testnets">Testnets</a></li>
           <li><a href="/gor">Game of Realms</a></li>
         </ul>