Set max line length in .editorconfig to 100

Kobzol · Kobzol · commit 993c1b8ed476 · 2023-09-04T21:41:55.000+02:00
It is enforced by CI, but it wasn't set in the config.
diff --git a/.editorconfig b/.editorconfig
@@ -7,3 +7,6 @@ insert_final_newline = true
 [ci/*.sh]
 indent_style = space
 indent_size = 2
+
+[src/*.md]
+max_line_length = 100
