Move bootstrap dir to conform to dotfile structure

Removed underscore from bootstrap directory, since the repository does
not organize itself through underscore prefixes anymore.

Fixed package gathering git-hook to respect new bootstrap directory.

.githooks/prepare-commit-msg

@@ -3,8 +3,9 @@
 COMMIT_MSG_FILE="$1"
 COMMIT_SOURCE="$2"
 
-pkgfileloc="$(git rev-parse --show-toplevel)/_bootstrap/packages.txt"
-pkgignoreloc="$(git rev-parse --show-toplevel)/_bootstrap/packages_ignore.txt"
+BOOTSTRAPDIR="bootstrap"
+pkgfileloc="$(git rev-parse --show-toplevel)/$BOOTSTRAPDIR/packages.txt"
+pkgignoreloc="$(git rev-parse --show-toplevel)/$BOOTSTRAPDIR/packages_ignore.txt"
 listgen="yay"
 
 err() {