every tool writes its own manual page

Cargo.lock

@@ -204,6 +204,7 @@ name = "catena-cli"
 version = "0.1.0"
 dependencies = [
  "clap",
+ "clap_mangen",
  "corpus-core",
  "serde",
 ]
@@ -295,6 +296,16 @@ version = "1.1.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "1c133bc6a41be0d194c306b5506d15e6feeea7b1d6604bd3f8310dfb2ca96486"
 
+[[package]]
+name = "clap_mangen"
+version = "0.3.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "211d617eaa4b735c96c9e0228fcbdb5120ef623f2b8cb67ffb84c3e02dbc28a4"
+dependencies = [
+ "clap",
+ "roff",
+]
+
 [[package]]
 name = "colorchoice"
 version = "1.0.5"
@@ -1098,6 +1109,12 @@ dependencies = [
  "windows-sys 0.52.0",
 ]
 
+[[package]]
+name = "roff"
+version = "1.1.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "323c417e1d9665a65b263ec744ba09030cfb277e9daa0b018a4ab62e57bc8189"
+
 [[package]]
 name = "rrf"
 version = "0.1.0"