♻️(frontend) adapt custom blocks to new implementation

Last release of Blocknote introduced breaking
changes for custom blocks.
We adapted our custom blocks to the new
implementation.
"code-block" is considered as a block now, we
update the way to import and use it.
The custom blocks should be now more tiptap friendly.

CHANGELOG.md

@@ -8,6 +8,7 @@ and this project adheres to
 
 ### Changed
 
+- ♻️(frontend) adapt custom blocks to new implementation #1375
 - ♻️(backend) increase user short_name field length
 
 ### Fixed
@@ -42,10 +43,6 @@ and this project adheres to
 - ✨(frontend) add pdf block to the editor #1293
 - ✨List and restore deleted docs #1450
 
-### Fixed
-
-- 🐛(frontend) show full nested doc names with ajustable bar #1456
-
 ### Changed
 
 - ♻️(frontend) Refactor Auth component for improved redirection logic #1461