Use #!/usr/bin/env shebang instead

Using `#!/usr/bin/env bash` instead of `#!/bin/bash` makes scripts more
portable. bash isn't guaranteed to be in /bin/ on every system.
/usr/bin/env uses the users's path, which should always find bash for
us.

(Technically we could make it even *more* portable via

bash/check-dependencies.sh

@@ -1,4 +1,4 @@
-#!/bin/bash
+#!/usr/bin/env bash
 
 # Abort if any command fails.
 set -e

bash/feed-reader.sh

@@ -1,4 +1,5 @@
-#!/bin/bash
+#!/usr/bin/env bash
+
 feed2exec \
     parse \
     https://www.nasa.gov/rss/dyn/breaking_news.rss \

bash/storytime.sh

@@ -1,51 +1,5 @@
-#!/bin/bash
-# Abort if any command fails.
-set -e
+#!/usr/bin/env bash
 
-# Check for presence of a command.
-# $1 is name of dependency
-# $2 is command that gets run to check for it
-# eg. check "disroot.org reachable?" "ping disroot.org"
-check() {
-  echo -n "Checking for $1... "
-
-  if eval $2 &> /dev/null ; then
-    echo ✔︎
-    false
-  else
-    echo ✗
-    storytime_ready=false
-    true
-  fi
-}
-
-# assume ready until proven otherwise
-storytime_ready=true
-
-if check "cron" "crontab -l"; then
-  echo "  Please install cron."
-fi
-
-if check "mimic3" "mimic3 --version"; then
-  echo "  Please install mimic3."
-  echo "  Via pip: pip3 install mycroft-mimic3-tts[all]"
-fi
-
-if check "ffmpeg 7" "ffmpeg -version | grep \"ffmpeg version 7\""; then
-  echo "  Please install ffmpeg ~7."
-fi
-
-if check "feed2exec" "feed2exec"; then
-  echo "  Please install feed2exec."
-  echo "  Via pip: pip3 install feed2exec"
-fi
-
-# final check for readiness
-if $storytime_ready; then
-  echo -e "\nReady for Storytime!"
-else
-  echo -e "\nStorytime is not ready to go. Please install the missing dependencies."
-fi
 figlet "Fetching feed items."
 figlet "Reading into an audio file."
 figlet "Mixing video."

bash/tts-to-file.sh

@@ -1,3 +1,4 @@
-#!/bin/bash
+#!/usr/bin/env bash
+
 mimic3 --voice en_US/hifi-tts_low#92 --length-scale .95 "$1" > /tmp/stage.wav
 ffmpeg -y -i /tmp/stage.wav -f s16le -acodec pcm_s16le -ar 22050 -c:a libmp3lame /tmp/output.mp3

bash/video-builder.sh

@@ -1,4 +1,5 @@
-#!/bin/bash
+#!/usr/bin/env bash
+
 ffmpeg -loop 1 -i ../media-assets/sample_pic.png \
        -i /tmp/output.mp3 \
        -shortest \