Consolidate catsh history documentation

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-.Dd January 14, 2019
-.Dt CATSH 7
-.Os "Causal Agency"
-.
-.Sh NAME
-.Nm catsh
-.Nd a shell
-.
-.Sh DESCRIPTION
-.Nm
-is a shell derived from
-.Fx
-.Xr sh 1 ,
-which is in turn derived from Almquist shell.
-It includes
-.Xr editline 3
-from
-.Nx .
-.
-.Ss Differences from Xr sh 1
-.Bl -bullet
-.It
-.Va ENV
-defaults to
-.Ql ${XDG_CONFIG_HOME:-${HOME}/.config}/catsh/env.sh .
-.
-.It
-.Va PS0
-is printed before each prompt,
-allowing multi-line prompts.
-.
-.It
-Right-aligned prompts can be set with
-.Va RPS1
-and
-.Va RPS2 .
-.
-.It
-.Va PSlit
-can be used to embed terminal escape sequences in prompts,
-as in
-.Nx
-.Xr sh 1 .
-.
-.It
-.Va HOME
-is shortened to
-.Sq ~
-in prompt expansion.
-.
-.It
-.Ic fc Fl s Ar = Ns Ar new
-allows prefixing commands with
-.Ar new .
-.El
-.
-.Sh HISTORY
-.Xr sh 1
-sources were imported from
-.Fx 12.0 .
-.Xr editline 3
-sources were imported from
-.Nx 8.0 .