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/grep.md

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+## Name
+
+grep
+
+## Synopsis
+
+```sh
+$ grep [--recursive] [--extended-regexp] [--regexp Pattern] [-i] [--invert-match] [--quiet] [--no-messages] [--binary-mode ] [--text] [-I] [--color WHEN] [file...]
+```
+
+## Options:
+
+* `--help`: Display help message and exit
+* `--version`: Print version
+* `-r`, `--recursive`: Recursively scan files
+* `-E`, `--extended-regexp`: Extended regular expressions
+* `-e Pattern`, `--regexp Pattern`: Pattern
+* `-i`: Make matches case-insensitive
+* `-v`, `--invert-match`: Select non-matching lines
+* `-q`, `--quiet`: Do not write anything to standard output
+* `-s`, `--no-messages`: Suppress error messages for nonexistent or unreadable files
+* `--binary-mode`: Action to take for binary files ([binary], text, skip)
+* `-a`, `--text`: Treat binary files as text (same as --binary-mode text)
+* `-I`: Ignore binary files (same as --binary-mode skip)
+* `--color WHEN`: When to use colored output for the matching text ([auto], never, always)
+
+## Arguments:
+
+* `file`: File(s) to process
+
+<!-- Auto-generated through ArgsParser -->