docs: cleanups improvements and fighting sphinx

- Hide links to internal code listings, and link to github instead
- Improve formatting of code/example captions
- Fix outdated documentation of command-line options
- Complete documentation of all events + improved formatting
- tcp_open -> tcp_start, tcp_close -> tcp_end to reduce confusion

docs/scripting/context.rst

@@ -0,0 +1,4 @@
+.. _context:
+
+Context
+=======