Part I no longer has its own section on editor support

It said less than Appendix D does, and some of it was no longer true:
Appendix D covers bjomode.el and samizdat-mode.el.

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Co-Authored-By: eca-agent <git@eca.dev>

_01.Language-basics.sz

@@ -79,11 +79,6 @@ This can then be destructed using pattern matching.
     (_ (panic! "This should not happen."))))
 }
 
-@subsubsection{Editor support}
-
-Bjolang was written in emacs, and emacs is currently the only editor with limited bjolang support through the file bjomode.el in the @link["https://github.com/bjoli/Bjolang"]{main github repository}. It lacks any fancy things, but handles a modicum of indentation and syntax highlighting.
-
-
 @subsection{Values, types and signatures}
 These are the bjolang literals:
 @read-table{