Manpages: Auto-generate many through ArgsParser

This set was hand-curated, guided by the questions:
- Does it have at least three options, i.e. is the help page
  non-trivial?
- Is the program unusual, i.e. does listing it in Help or on
  man.serenityos.org spread awareness?
- Is the program common, but we only implement a subset of 'common'
  flags?

Base/usr/share/man/man1/nc.md

@@ -0,0 +1,29 @@
+## Name
+
+nc
+
+## Synopsis
+
+```sh
+$ nc [--listen] [--verbose] [--udp] [-N] <target> <port>
+```
+
+## Description
+
+Network cat: Connect to network sockets as if it were a file.
+
+## Options:
+
+* `--help`: Display help message and exit
+* `--version`: Print version
+* `-l`, `--listen`: Listen instead of connecting
+* `-v`, `--verbose`: Log everything that's happening
+* `-u`, `--udp`: UDP mode
+* `-N`: Close connection after reading stdin to the end
+
+## Arguments:
+
+* `target`: Address to listen on, or the address or hostname to connect to
+* `port`: Port to connect to or listen on
+
+<!-- Auto-generated through ArgsParser -->