feat: scaffold howtos project

Collection of usage guides and cheatsheets. Includes project docs,
topic template, and directory structure.

TODO.md

@@ -0,0 +1,20 @@
+# TODO
+
+## Topics to Write
+
+- [ ] git — common workflows, rebase, stash, bisect
+- [ ] ansible — playbook patterns, inventory, vault
+- [ ] podman — build, run, compose, volumes
+- [ ] jq — filters, select, map, slurp
+- [ ] curl — headers, auth, methods, output
+- [ ] systemd — units, journalctl, timers
+- [ ] ssh — config, tunnels, keys, agent
+- [ ] bash — parameter expansion, arrays, traps
+- [ ] make — targets, variables, patterns
+- [ ] vim — motions, registers, macros
+
+## Improvements
+
+- [ ] Format linter script
+- [ ] Auto-generate index from topics/
+- [ ] Add last-reviewed date to template