Update README re: Helix editor configuration (#97)

Since helix-editor/helix#3499 was merged marksman is supported out of the box by Helix.

Co-authored-by: Nathaniel Graham <ngraham@protonmail.com>
Co-authored-by: Artem Pyanykh <arr@fb.com>

README.md

@@ -65,20 +65,7 @@ for wiki-links to detect broken references and duplicate/ambiguous headings.
       (add-to-list 'eglot-server-programs '(markdown-mode . ("marksman")))      
       (add-hook 'markdown-mode-hook #'eglot-ensure)
       ````
-* [Helix][helix-editor] requires configuration (unless
-  [helix#3499][helix-marksman-pr] gets merged); add the following to your
-  `~/.config/helix/languages.toml`:
-
-  ```toml
-  [[language]]
-  name = "markdown"
-  scope = "source.md"
-  injection-regex = "md|markdown"
-  file-types = ["md"]
-  roots = [".marksman.toml"]
-  language-server = { command = "marksman", args=["server"] }
-  indent = { tab-width = 2, unit = "  " }
-  ```
+* [Helix](https://helix-editor.com/) supports Marksman out of the box. However, you need add `marksman` binary to your `PATH` manually.
 * Sublime Text via [LSP-marksman][sublime-marksman] (automatic server
   installation).