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/ifconfig.md

@@ -0,0 +1,24 @@
+## Name
+
+ifconfig
+
+## Synopsis
+
+```sh
+$ ifconfig [--ipv4 ip] [--adapter adapter] [--gateway gateway] [--mask mask]
+```
+
+## Description
+
+Display or modify the configuration of each network interface.
+
+## Options:
+
+* `--help`: Display help message and exit
+* `--version`: Print version
+* `-i ip`, `--ipv4 ip`: Set the IP address of the selected network
+* `-a adapter`, `--adapter adapter`: Select a specific network adapter to configure
+* `-g gateway`, `--gateway gateway`: Set the default gateway of the selected network
+* `-m mask`, `--mask mask`: Set the network mask of the selected network
+
+<!-- Auto-generated through ArgsParser -->