Move pages under tldr, lint run.sh, update docs

tldr/st-util

@@ -0,0 +1,21 @@
+---
+syntax: markdown
+tags: [tldr, common]
+source: https://github.com/tldr-pages/tldr.git
+---
+# st-util
+
+> Run GDB (GNU Debugger) server to interact with STM32 ARM Cortex microcontoller.
+> More information: <https://github.com/texane/stlink>.
+
+- Run GDB server on port 4500:
+
+`st-util -p {{4500}}`
+
+- Connect to GDB server:
+
+`(gdb) target extended-remote {{localhost}}:{{4500}}`
+
+- Write firmware to device:
+
+`(gdb) load {{firmware.elf}}`