Documentation: Consistency: Mention CONFIG_DIR default, legacy locati…

…on for completion

Add a note that the legacy locations (now also consistently used for the completion script) are not recommended, just to illustrate how to override the default locations.

README.md

@@ -41,12 +41,13 @@ make test
 
 *NOTE:* Makefile defaults to several default paths for installed files. Adjust to your system:
 
-- `INSTALL_DIR`: PATH for executables (default /usr/local/bin)
-- `CONFIG_DIR`: PATH for the todo.txt configuration template
+- `INSTALL_DIR`: PATH for executables (default `/usr/local/bin`)
+- `CONFIG_DIR`: PATH for the `todo/config` configuration template (default `/usr/local/etc`)
 - `BASH_COMPLETION`: PATH for autocompletion scripts (default to `/usr/local/share/bash-completion/completions`)
 
 ```shell
-make install CONFIG_DIR=/etc INSTALL_DIR=/usr/bin BASH_COMPLETION=/usr/share/bash-completion/completions
+# Note: Showcasing config overrides for legacy locations; NOT recommended!
+make install CONFIG_DIR=/etc INSTALL_DIR=/usr/bin BASH_COMPLETION=/etc/bash_completion.d
 ```
 
 #### Arch Linux (AUR)