README: Remove DocBook-specific instructions

README.md

@@ -9,44 +9,3 @@ You can also build them locally:
 Similarly, for an [EPUB](https://www.w3.org/publishing/epub32/) version, run:
 
     nix-build release.nix -A epub && foliate result/share/doc/nix-pills/nix-pills.epub
-
-## Development
-
- - [List of DocBook Elements](https://tdg.docbook.org/tdg/5.2/part2.html)
-
-Emacs config for a nice DocBook experience:
-
- ```nix
- let
-  pkgs = import <nixpkgs> {};
-  inherit (pkgs) emacsPackagesNg docbook5 writeText;
-
-  schemas = writeText "schemas.xml" ''
-    <locatingRules xmlns="http://thaiopensource.com/ns/locating-rules/1.0">
-      <documentElement localName="section" typeId="DocBook"/>
-      <documentElement localName="chapter" typeId="DocBook"/>
-      <documentElement localName="article" typeId="DocBook"/>
-      <documentElement localName="book" typeId="DocBook"/>
-      <typeId id="DocBook" uri="${docbook5}/xml/rng/docbook/docbookxi.rnc" />
-    </locatingRules>
-  '';
-
-in emacsPackagesNg.emacsWithPackages (epkgs: [
-  (emacsPackagesNg.trivialBuild {
-    pname = "nix-docbook-mode";
-    version = "1970-01-01";
-    src = writeText "default.el" ''
-      (eval-after-load 'rng-loc
-        '(add-to-list 'rng-schema-locating-files "${schemas}"))
-      (global-set-key (kbd "<C-return>") 'nxml-complete)
-    '';
-  })
-])
-```
-
-Then you can use the keys:
-
-
- - `C-c C-b` to finish & close a tag
- - `C-c C-f` to close a tag
- - `C-return` to auto-complete a tag or attribute.