Fix rust docs deploy (#2615)

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### What

Remove the `/target/doc` directory before building and deploying docs.
This should fix the rust docs deploy issue, but it will be unconfirmed
until we merge into main

Also removes the `files.exclude` vscode setting for already gitignored
directories. I keep having to dig into target dirs and/or the venv and
it's pretty annoying to keep this change around locally inbetween all
the git checkouts. I don't see why we need it in the first place, it
just removes the files from the explorer pane. That makes it a bit
shorter, but not by a lot.

### Checklist
* [x] I have read and agree to [Contributor
Guide](https://github.com/rerun-io/rerun/blob/main/CONTRIBUTING.md) and
the [Code of
Conduct](https://github.com/rerun-io/rerun/blob/main/CODE_OF_CONDUCT.md)
* [x] I've included a screenshot or gif (if applicable)
* [x] I have tested [demo.rerun.io](https://demo.rerun.io/pr/2615) (if
applicable)

- [PR Build Summary](https://build.rerun.io/pr/2615)
- [Docs
preview](https://rerun.io/preview/pr%3Ajan%2Ffix-deploy-docs/docs)
- [Examples
preview](https://rerun.io/preview/pr%3Ajan%2Ffix-deploy-docs/examples)

.github/workflows/reusable_deploy_docs.yml

@@ -1,4 +1,4 @@
-name: 'Reusable Deploy Docs'
+name: "Reusable Deploy Docs"
 
 on:
   workflow_call:
@@ -33,8 +33,7 @@ env:
   RUSTC_WRAPPER: "sccache"
 
 jobs:
-
-# ---------------------------------------------------------------------------
+  # ---------------------------------------------------------------------------
 
   py-deploy-docs:
     name: Python
@@ -90,8 +89,7 @@ jobs:
           git commit -m "Update docs for ${GITHUB_SHA}"
           git push origin gh-pages-orphan:gh-pages -f
 
-
-# ---------------------------------------------------------------------------
+  # ---------------------------------------------------------------------------
 
   rs-deploy-docs:
     name: Rust
@@ -129,6 +127,9 @@ jobs:
       - name: Run sccache-cache
         uses: mozilla-actions/[email protected]
 
+      - name: Delete existing /target/doc
+        run: rm -rf ./target/doc
+
       - name: cargo doc --document-private-items
         uses: actions-rs/cargo@v1
         with:
@@ -156,3 +157,4 @@ jobs:
         run: |
           git fetch
           python3 -m ghp_import -n -p -x docs/rust/head target/doc/ -m "Update the rust docs"
+