https://blog.fastdot.com/wordpress/block-notes-register-a-custom-block-category/?seraph_accel_prep=eyJub25jZSI6IjA4ZWYyOWMyZjA0YmFkZjM4Mjc3NTA0YzRiNzViODJhIiwiX3RtIjoiMTcxNTg3ODQ5NC42OTMxIiwicGMiOiJBYkhMazgiLCJscm4iOiJcL3NcL21cL3ZcL2NtblwvbFwvQFwvZDQ5YTVjODZmOTYwMDM0YjU4Njk4ODQ5ZDlmY2U4YzUuZGF0Lmd6In0=