feat(shell): Update to my new SOTA

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+% FUPDATE(1) fupdate 1.0.0
+% Benedikt Peetz
+% May 2023
+
+# NAME
+
+fupdate - updates your flake, while checking for common mistakes
+
+# SYNOPSIS
+
+**fupdate** list of \[*flake*|*\<some word>*|*--help*|*-h*\]
+
+# DESCRIPTION
+
+Argument can be stacked, this makes it possible to specify multiple targets to be updated in succession. See the Examples section for further details.
+
+No argument or *flake*
+: **fupdate**, when executed without arguments or with *flake*, will update your *flake.lock*, check for duplicate flake inputs, i.e., an input has an input declared, which you have also declared as input, and will run a script called *update.sh*, if you allow it.
+The allowance for the script is asked, when you run **fupdate** and the found script is not yet allowed. Furthermore, the allowance is based on the concrete sha256 hash of the script, so any changes will require another allowance.
+
+**\<some word>** as argument
+: If the executable **update-\<some word>** is reachable thought the PATH variable, than this is run. Otherwise, the program will exit.
+
+# OPTIONS
+
+**--help**, **-h**
+: Displays a help message and exit.
+
+**--version**, **-v**
+: Displays the software version and exit.
+
+# EXAMPLES
+
+**fupdate** or **fupdate flake**
+: Updates your *flake.lock*. See the Description section for further details.
+
+**fupdate sys**
+: Run the executable **update-sys**, if it exists. See the Description section for further details.
+
+**fupdate flake sys docs**
+: First updates your flake, then, if the command succeeded, runs **update-sys**, afterweich **update-docs** is run.
+
+# FILES
+
+*update.sh*
+: This is supposed to be a shell script located in your flake base directory, i.e., the directory which contains both a *flake.nix* and a *flake.lock* file.
+
+*~/.local/share/flake-update/*
+: **fupdate** will store the hashes to the allowed *update.sh* files here.
+
+# BUGS
+
+Report bugs to <https://codeberg.org/soispha/flake_update/issues>.
+
+# COPYRIGHT
+
+Copyright (C) 2023  Benedikt Peetz
+
+This program is free software: you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation, either version 3 of the License, or
+(at your option) any later version.
+
+This program is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+GNU General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with this program.  If not, see <https://www.gnu.org/licenses/>.