fix plzidx issues, include bulma and systemd unit

hedgedoc-tag-searcher/plzidx.service

@@ -0,0 +1,13 @@
+[Unit]
+Description=Gunicorn instance to serve hedgedoc-tag-searcher
+After=network.target
+
+[Service]
+RuntimeDirectory=plzidx
+RuntimeDirectoryMode=755
+User=plzidx
+Group=plzidx
+ExecStart=/usr/bin/gunicorn --workers 1 --bind unix:/run/plzidx/plzidx.sock -u plzidx -g plzidx 'plzidx:create_app()'
+
+[Install]
+WantedBy=multi-user.target