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/tree.md

@@ -0,0 +1,23 @@
+## Name
+
+tree
+
+## Synopsis
+
+```sh
+$ tree [--all] [--only-directories] [--maximum-depth level] [directories...]
+```
+
+## Options:
+
+* `--help`: Display help message and exit
+* `--version`: Print version
+* `-a`, `--all`: Show hidden files
+* `-d`, `--only-directories`: Show only directories
+* `-L level`, `--maximum-depth level`: Maximum depth of the tree
+
+## Arguments:
+
+* `directories`: Directories to print
+
+<!-- Auto-generated through ArgsParser -->