feat: scaffold howtos project

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

docs/INSTALL.md

@@ -0,0 +1,23 @@
+# Install
+
+## Prerequisites
+
+None. This is a plain Markdown collection.
+
+## Optional Tools
+
+For better terminal rendering:
+
+```bash
+# bat — syntax-highlighted cat
+sudo apt install bat
+
+# glow — terminal markdown renderer
+sudo apt install glow
+```
+
+## Clone
+
+```bash
+git clone <repo-url> ~/git/howtos
+```