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

tldr/checksec

@@ -0,0 +1,25 @@
+---
+syntax: markdown
+tags: [tldr, common]
+source: https://github.com/tldr-pages/tldr.git
+---
+# checksec
+
+> Check security properties of executables.
+> More information: <https://github.com/slimm609/checksec.sh>.
+
+- List security properties of an executable binary file:
+
+`checksec --file={{path/to/binary}}`
+
+- List security properties recursively of all executable files in a directory:
+
+`checksec --dir={{path/to/directory}}`
+
+- List security properties of a process:
+
+`checksec --proc={{pid}}`
+
+- List security properties of the running kernel:
+
+`checksec --kernel`