Better backtraces

This should not be enabled by something like (setq backtrace-line-length 0)
but unfortunately that's the way it is now in Emacs 29.1

--- a/docs/Makefile
+++ b/docs/Makefile
@@ -5,7 +5,7 @@
 all: index.html
 
 telega-manual.org: telega-ellit.org telega-note.org $(DOC_EL_SOURCES)
-	$(EMACS) --eval '(progn (defvar telega-note-file "telega-note.org") (let ((load-prefer-newer t) (debug-on-error t)) (load-library "telega") (ellit-org-export "telega-ellit.org" "telega-manual.org")))'
+	$(EMACS) --eval '(progn (defvar telega-note-file "telega-note.org") (setq backtrace-line-length 0) (let ((load-prefer-newer t) (debug-on-error t) (debugger-stack-frame-as-list t)) (load-library "telega") (ellit-org-export "telega-ellit.org" "telega-manual.org")))'
 
 index-release.html:
 	cp telega-note-release.org telega-note.org