feat: add changelogs, update old changelogs, update build scripts

scripts/update_changelogs.sh

@@ -0,0 +1,22 @@
+#!/usr/bin/env bash
+set -Eeuo pipefail
+
+__script_dir=$( cd "$( dirname "${BASH_SOURCE[0]}" )" && pwd )
+__target_dir=$__script_dir/../assets/changelogs
+readonly __script_dir
+# Receives locale as first argument
+function mergeChangelogs () {
+    __target_file=$__target_dir/changelogs_$1.md
+    rm -f $__target_file
+    touch $__target_file
+    ls $__script_dir/../android/fastlane/metadata/android/$1/changelogs/[0-9]*.txt | tac | while read f; do
+        __build_number="${f%.*}"
+        echo "# $(basename -- $__build_number)" >> $__target_file
+        cat $f >> $__target_file
+        printf "\n\n" >> $__target_file
+    done
+}
+
+mergeChangelogs 'en-US'
+mergeChangelogs 'de-DE'
+