Move config files to ~/.eRCaGuy_backup/ dir

[ElectricRCAircraftGuy]

Currently, config files are here:

~/.back_up_linux_pc.config.sh
~/.back_up_linux_pc.files_to_exclude.rsync
~/.back_up_linux_pc.files_to_include.rsync

Move them to be in a ~/.back_up_linux_pc/ dir instead, like this:

~/.back_up_linux_pc/config.sh
~/.back_up_linux_pc/files_to_exclude.rsync
~/.back_up_linux_pc/files_to_include.rsync

This will shorten the filenames and allow more versatility, so you can store multiple sets of config files here.

Update: actually, use this folder name instead, to match this repo's name:

~/.eRCaGuy_backup/config.sh
~/.eRCaGuy_backup/files_to_exclude.rsync
~/.eRCaGuy_backup/files_to_include.rsync