Add screenshots.md with Flameshot and Knip notes

screenshots.md

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+# Screenshots
+
+## Flameshot
+
+Flameshot v12.1.0 is installed at `/usr/bin/flameshot`.
+
+| Command | Description |
+|---|---|
+| `flameshot launcher` | Open the capture launcher (recommended) |
+| `flameshot gui` | Start a manual (rectangular) capture |
+| `flameshot screen` | Capture a single screen |
+| `flameshot full` | Capture the entire desktop |
+| `flameshot config` | Open the configuration dialog |
+
+Launches a tray icon by default for quick access.
+
+## Knip
+
+Knip is **not installed** on this machine. Install it per-project:
+
+```sh
+npx knip                       # dry-run report
+npx knip --fix                 # auto-remove unused exports
+npx knip --config knip.config.ts   # custom config
+```
+
+Fix npm cache ownership first if you hit `EACCES`:
+
+```sh
+sudo chown -R 1000:1000 /home/willem/.npm
+```