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

tldr/pkill

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+---
+syntax: markdown
+tags: [tldr, common]
+source: https://github.com/tldr-pages/tldr.git
+---
+# pkill
+
+> Signal process by name.
+> Mostly used for stopping processes.
+> More information: <https://www.man7.org/linux/man-pages/man1/pkill.1.html>.
+
+- Kill all processes which match:
+
+`pkill "{{process_name}}"`
+
+- Kill all processes which match their full command instead of just the process name:
+
+`pkill -f "{{command_name}}"`
+
+- Force kill matching processes (can't be blocked):
+
+`pkill -9 "{{process_name}}"`
+
+- Send SIGUSR1 signal to processes which match:
+
+`pkill -USR1 "{{process_name}}"`
+
+- Kill the main `firefox` process to close the browser:
+
+`pkill --oldest "{{firefox}}"`