feat: discogs description and bugfixes

src/sh/preview.sh

@@ -1,6 +1,9 @@
 # Print preview of artist
 # @input $1: MusicBrainz Artist ID
 __preview_artist() {
-  desc=$(mb_artist_enwikipedia "$1" | $JQ -r ".extract")
+  desc=$(mb_artist_enwikipedia "$1" | $JQ -r '.extract')
+  if [ ! "$desc" ]; then
+    desc=$(mb_artist_discogs "$1" | $JQ -r '.profile' | sed 's/\[a=\([^]]*\)\]/\1/g')
+  fi
   echo "$desc" | fold -s -w "$FZF_PREVIEW_COLUMNS" | $CAT
 }