remove docs accidentally added to version control

doc/manual/src/command-ref/conf-file.md.tmp

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-# Name
-
-`nix.conf` - Nix configuration file
-
-# Description
-
-By default Nix reads settings from the following places:
-
-  - The system-wide configuration file `sysconfdir/nix/nix.conf` (i.e.
-    `/etc/nix/nix.conf` on most systems), or `$NIX_CONF_DIR/nix.conf` if
-    `NIX_CONF_DIR` is set. Values loaded in this file are not forwarded
-    to the Nix daemon. The client assumes that the daemon has already
-    loaded them.
-
-  - If `NIX_USER_CONF_FILES` is set, then each path separated by `:`
-    will be loaded in reverse order.
-
-    Otherwise it will look for `nix/nix.conf` files in `XDG_CONFIG_DIRS`
-    and `XDG_CONFIG_HOME`. If these are unset, it will look in
-    `$HOME/.config/nix.conf`.
-
-  - If `NIX_CONFIG` is set, its contents is treated as the contents of
-    a configuration file.
-
-The configuration files consist of `name = value` pairs, one per
-line. Other files can be included with a line like `include path`,
-where *path* is interpreted relative to the current conf file and a
-missing file is an error unless `!include` is used instead. Comments
-start with a `#` character. Here is an example configuration file:
-
-    keep-outputs = true       # Nice for developers
-    keep-derivations = true   # Idem
-
-You can override settings on the command line using the `--option`
-flag, e.g. `--option keep-outputs false`. Every configuration setting
-also has a corresponding command line flag, e.g. `--max-jobs 16`; for
-Boolean settings, there are two flags to enable or disable the setting
-(e.g. `--keep-failed` and `--no-keep-failed`).
-
-A configuration setting usually overrides any previous value. However,
-you can prefix the name of the setting by `extra-` to *append* to the
-previous value. For instance,
-
-    substituters = a b
-    extra-substituters = c d
-
-defines the `substituters` setting to be `a b c d`. This is also
-available as a command line flag (e.g. `--extra-substituters`).
-
-The following settings are currently available:
-
-EvalCommand::getEvalState()0