lib/bash: remove unused Bash library files

The color echo functions are provided by `lib/bash/home-manager.sh`.

lib/bash/color-echo

@@ -1,41 +0,0 @@
-#!/usr/bin/env bash
-
-# The check for terminal output and color support is heavily inspired
-# by https://unix.stackexchange.com/a/10065.
-#
-# Allow opt out by respecting the `NO_COLOR` environment variable.
-
-function setupColors() {
-    normalColor=""
-    errorColor=""
-    warnColor=""
-    noteColor=""
-
-    # Enable colors for terminals, and allow opting out.
-    if [[ ! -v NO_COLOR && -t 1 ]]; then
-        # See if it supports colors.
-        local ncolors
-        ncolors=$(tput colors)
-
-        if [[ -n "$ncolors" && "$ncolors" -ge 8 ]]; then
-            normalColor="$(tput sgr0)"
-            errorColor="$(tput bold)$(tput setaf 1)"
-            warnColor="$(tput setaf 3)"
-            noteColor="$(tput bold)$(tput setaf 6)"
-        fi
-    fi
-}
-
-setupColors
-
-function errorEcho() {
-    echo "${errorColor}$*${normalColor}"
-}
-
-function warnEcho() {
-    echo "${warnColor}$*${normalColor}"
-}
-
-function noteEcho() {
-    echo "${noteColor}$*${normalColor}"
-}

modules/lib-bash/color-echo.sh

@@ -1,39 +0,0 @@
-# The check for terminal output and color support is heavily inspired
-# by https://unix.stackexchange.com/a/10065.
-#
-# Allow opt out by respecting the `NO_COLOR` environment variable.
-
-function setupColors() {
-    normalColor=""
-    errorColor=""
-    warnColor=""
-    noteColor=""
-
-    # Enable colors for terminals, and allow opting out.
-    if [[ ! -v NO_COLOR && -t 1 ]]; then
-        # See if it supports colors.
-        local ncolors
-        ncolors=$(tput colors)
-
-        if [[ -n "$ncolors" && "$ncolors" -ge 8 ]]; then
-            normalColor="$(tput sgr0)"
-            errorColor="$(tput bold)$(tput setaf 1)"
-            warnColor="$(tput setaf 3)"
-            noteColor="$(tput bold)$(tput setaf 6)"
-        fi
-    fi
-}
-
-setupColors
-
-function errorEcho() {
-    echo "${errorColor}$*${normalColor}"
-}
-
-function warnEcho() {
-    echo "${warnColor}$*${normalColor}"
-}
-
-function noteEcho() {
-    echo "${noteColor}$*${normalColor}"
-}