fix(examples): Disable back-culling for triangle and triangles examples

[vmarcella]

Summary

Previously, triangle and triangles didn't disable back-culling (Which defaults to counter-clockwise back culling), making the triangles get culled out of the frames, thus not being rendered at all.

Related Issues

N/A

Changes

• Disabled back-culling in the render pipelines for each example
• Added tutorials for each example

Type of Change

• Bug fix (non-breaking change that fixes an issue)
• Feature (non-breaking change that adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)
• Documentation (updates to docs, specs, tutorials, or comments)
• Refactor (code change that neither fixes a bug nor adds a feature)
• Performance (change that improves performance)
• Test (adding or updating tests)
• Build/CI (changes to build process or CI configuration)

Affected Crates

• lambda-rs
• lambda-rs-platform
• lambda-rs-args
• lambda-rs-logging
• Other:

Checklist

• Code follows the repository style guidelines (cargo +nightly fmt --all)
• Code passes clippy (cargo clippy --workspace --all-targets -- -D warnings)
• Tests pass (cargo test --workspace)
• New code includes appropriate documentation
• Public API changes are documented
• Breaking changes are noted in this PR description

Testing

Commands run:

cargo build --workspace
cargo test --workspace

Manual verification steps (if applicable):

N/A

Screenshots/Recordings

N/A

Platform Testing

• macOS
• Windows
• Linux

Additional Notes