Add Djot language support (zed-industries#5206)

- Adds [Djot](https://djot.net/) markup language support for Zed
- Syntax highlighting, bracket matching, indentation, outline, and
language injection for code blocks
- Uses [tree-sitter-djot](https://github.com/nzoschke/tree-sitter-djot)
(fork with WASI-compatible scanner)

🤖 Generated with [Claude Code](https://claude.com/claude-code)

---------

Co-authored-by: Claude Opus 4.6 <noreply@anthropic.com>
Co-authored-by: Finn Evers <finn@zed.dev>

Author: 3 people

.gitmodules

@@ -1070,6 +1070,10 @@
 	path = extensions/django-snippets
 	url = https://github.com/bencres/zed-django-snippets.git
 
+[submodule "extensions/djot"]
+	path = extensions/djot
+	url = https://github.com/nzoschke/zed-djot.git
+
 [submodule "extensions/docker-compose"]
 	path = extensions/docker-compose
 	url = https://github.com/eth0net/zed-docker-compose.git

extensions.toml

@@ -1087,6 +1087,10 @@ version = "0.2.2"
 submodule = "extensions/django-snippets"
 version = "0.0.1"
 
+[djot]
+submodule = "extensions/djot"
+version = "0.1.0"
+
 [docker-compose]
 submodule = "extensions/docker-compose"
 version = "0.1.0"