Add HowToScreenRecordPage and update .gitignore #6053

Job	Run time
Detect Changes	7s
Format (Biome)	8s
Typecheck	1m 39s
Format (Cargo)	17s
Lint (Biome)	17s
Rust cache (x86_64-apple-darwin, macos-latest)	3m 0s
Rust cache (x86_64-pc-windows-msvc, windows-latest)	9m 8s
Rust cache (aarch64-apple-darwin, macos-latest)	4m 8s
Build Desktop	0s
Verify Tauri plugin versions	0s
Clippy	0s
	18m 44s

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