Add missing examples to the example manifest

[nikolausWest]

There are several useful examples that we keep in separate repositories that aren't currently easy to find under rerun.io/examples. There are also examples we have in the repository that aren't discoverable on the website. We should add these to the example manifest to make the easier to find for our users. This includes, any ROS bridges or interesting dataloaders.

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Related to:

• New categories for examples #5665

External examples:

• https://github.com/rerun-io/cpp-example-ros-bridge: Added ros_bridge external example #5785
• https://github.com/rerun-io/rerun-loader-python-example-urdf: Add urdf_loader external example #5789
• https://github.com/rerun-io/example-rs-github-stars ?
• https://github.com/rerun-io/rerun-loader-python-example-tfrecord: Add tfrecord_loader external example #5790
• https://github.com/rerun-io/rerun-loader-python-example-docx
• https://github.com/rerun-io/web-viewer-react-example
• https://github.com/rerun-io/web-viewer-example
• Revy

Internal examples:

• shared_recordings
• log_file “rerun_example_log_file”
• external_data_loader
• incremental_logging
• notebook
• stdio

Code snippets that aren't used anywhere in docs:

• manual_indicator
• quick_start_connect
• quick_start_spawn

[emilk]

We should maybe add a lint so that we don't forget adding examples to the manifest