chore(rc,profile,aliases,completion,libs,functions): Remove shebangs from sourced files

These files are always sourced (never executed directly), so the
#!/bin/bash shebang is inert and misleading. Drop it consistently
across rc.d/*, profile.d/*, and aliases.d/*.

libs/term.bash

@@ -1,5 +1,3 @@
-#!/bin/bash
-
 function term_change_title {
 	case $TERM in
 	# Change the window title of X terminals