Merge pull request #1921 from mech-a/patch-1

doc: add remark-d2 to community plugins

Author: alixander

README.md

@@ -260,6 +260,7 @@ let us know and we'll be happy to include it here!
 - **Logseq-D2**: [https://github.com/b-yp/logseq-d2](https://github.com/b-yp/logseq-d2)
 - **ent2d2**: [https://github.com/tmc/ent2d2](https://github.com/tmc/ent2d2)
 - **MkDocs Plugin**: [https://github.com/landmaj/mkdocs-d2-plugin](https://github.com/landmaj/mkdocs-d2-plugin)
+- **Remark Plugin**: [https://github.com/mech-a/remark-d2](https://github.com/mech-a/remark-d2)
 
 ### Misc