Cleanup examples (#5817)

- Remove outdated examples
- Rename folders for consistency
- Remove lots of unused deps in angular example.
- Rename `name` inside `package.json`'s from `@uppy-example/*` to
`example-*`.

**Before**

```
├── angular-example
├── aws-companion
├── aws-nodejs
├── aws-php
├── bundled
├── cdn-example
├── custom-provider
├── digitalocean-spaces
├── multiple-instances
├── node-xhr
├── php-xhr
├── python-xhr
├── react
├── react-native-expo
├── redux
├── sveltekit
├── transloadit
├── transloadit-markdown-bin
├── uppy-with-companion
├── vue3
└── xhr-bundle
```

**After**

```
examples
├── angular
├── aws-companion
├── aws-nodejs
├── aws-php
├── cdn
├── companion
├── companion-custom-provider
├── companion-digitalocean-spaces
├── react
├── react-native-expo
├── redux
├── sveltekit
├── transloadit
├── vue
├── xhr-bundle
├── xhr-node
├── xhr-php
└── xhr-python
```

examples/xhr-python/package.json

@@ -0,0 +1,22 @@
+{
+  "name": "example-xhr-python",
+  "version": "0.0.0",
+  "type": "module",
+  "dependencies": {
+    "@uppy/core": "workspace:*",
+    "@uppy/dashboard": "workspace:*",
+    "@uppy/webcam": "workspace:*",
+    "@uppy/xhr-upload": "workspace:*"
+  },
+  "devDependencies": {
+    "npm-run-all": "^4.1.3",
+    "vite": "^5.4.17"
+  },
+  "private": true,
+  "scripts": {
+    "installPythonDeps": "python3 -m pip install -r requirements.txt",
+    "start": "npm-run-all --parallel start:server start:client",
+    "start:client": "vite",
+    "start:server": "mkdir -p uploads && python3 server.py"
+  }
+}