docs: include header and footer in manpages; move man to its own dir

docs/default.nix

@@ -127,10 +127,12 @@
 
       nixos-render-docs -j $NIX_BUILD_CORES options manpage \
         --revision ${revision} \
+        --header ${./man/header.5} \
+        --footer ${./man/footer.5} \
         ${nvimModuleDocs.optionsJSON}/share/doc/nixos/options.json \
         $out/share/man/man5/neovim-flake.5
 
-      cp ${./neovim-flake.1} $out/share/man/man1/neovim-flake.1
+      cp ${./man/neovim-flake.1} $out/share/man/man1/neovim-flake.1
     '';
 
   # Generate the HTML manual pages

docs/man/header.5

@@ -9,6 +9,5 @@
 neovim-flake configuration specification
 .SH "OPTIONS"
 .PP
-You can use the following options in
-home\-configuration\&.nix:
+You can use the following options to configure neovim-flake:
 .PP

docs/man/neovim-flake.1

@@ -9,13 +9,17 @@
 .cflags 4 /
 .Sh NAME
 .Nm neovim-flake
-.Nd a extensible and distro-agonistic Neovim configuration wrapper in Nix
+.Nd A highly modular, extensible and distro-agnostic Neovim distribution for Nix/NixOS.
 .
 .Sh BUGS
 .Pp
-Please report any bugs on the
+Please report any bugs that you might encounter on the
 \m[blue]\fBproject issue tracker\fR\m[]\&.
 
+.Sh SEE ALSO
+.Pp
+\fBneovim-flake\fR(5)
+
 .Sh AUTHOR
 .Pp
 \fBneovim-flake contributors\fR
@@ -25,5 +29,5 @@ Author.
 
 .Sh COPYRIGHT
 .br
-Copyright \(co 2017\(en2022 neovim-flake contributors
+Copyright \(co 2023\(en2024 neovim-flake contributors
 .br