Rename doomdirs/example and doom-example

Move `doomdirs/example/` to just `doomdir/`, and rename the package
using it from `doom-example` to `doom-emacs`.

I do not expect to need multiple doomdirs checked in again, and I can
unclutter the packages provided by the flake a bit now that most of them
are checks.

README.md

@@ -39,9 +39,9 @@ Please report any issues.
 > inputs are automatically updated daily as long as tests pass. Updating
 > manually may update to an incompatible version of Doom or Emacs packages.
 
-3. Copy your Doom configuration into `doomdirs/example` (overwriting what's there)
-4. Make sure all files are added (`git add doomdirs/example`)
-5. Run `nix run .#doom-example`.
+3. Copy your Doom configuration into `doomdir` (overwriting what's there)
+4. Make sure all files are added (`git add doomdir`)
+5. Run `nix run .#doom-emacs`.
 
 If this does not work, the "with flakes" setup below is unlikely to work either.
 Please file an issue.

checks.nix

@@ -69,9 +69,9 @@ in {
   })).emacsWithDoom;
   allModules = mkDoom { doomDir = allModsDoomDir; };
   allModulesAndFlags = mkDoom { doomDir = allFlagsDoomDir; };
-  example = mkDoom { doomDir = ./doomdirs/example; };
+  example = mkDoom { doomDir = ./doomdir; };
   example-without-loader = mkDoom {
-    doomDir = ./doomdirs/example;
+    doomDir = ./doomdir;
     profileName = "";
   };
   interactive = doomTest "minimal" { config = [ "default" ]; } { };

flake.nix

@@ -80,16 +80,16 @@
         makeDoomPackages = doomFromPackages pkgs;
       });
       packages = perSystemPackages (pkgs: {
-        doom-example = (doomFromPackages pkgs {
+        doom-emacs = (doomFromPackages pkgs {
           # TODO: drop after NixOS 24.05 release.
           emacs = pkgs.emacs29;
-          doomDir = ./doomdirs/example;
+          doomDir = ./doomdir;
           doomLocalDir = "~/.local/share/nix-doom-unstraightened";
         }).doomEmacs;
-        doom-example-without-loader = (doomFromPackages pkgs {
+        doom-emacs-without-loader = (doomFromPackages pkgs {
           # TODO: drop after NixOS 24.05 release.
           emacs = pkgs.emacs29;
-          doomDir = ./doomdirs/example;
+          doomDir = ./doomdir;
           doomLocalDir = "~/.local/share/nix-doom-unstraightened";
           profileName = "";
         }).doomEmacs;