maintaining: init

Add a MAINTAINING.md file where we can document internal maintenance
procedures.

Author: MattSturgeon

MAINTAINING.md

@@ -0,0 +1,4 @@
+# Maintaining Nixvim
+
+This file is intended as a reference for Nixvim's core maintainers, although it may be interesting for anyone curious how we do certain things.
+

docs/mdbook/SUMMARY.md

@@ -28,4 +28,5 @@
 ---
 
 [Contributing](./CONTRIBUTING.md)
+[Maintaining](./MAINTAINING.md)
 [NixVim Options Search](./search/index.html)

docs/mdbook/default.nix

@@ -347,6 +347,7 @@ pkgs.stdenv.mkDerivation (finalAttrs: {
   };
 
   contributing = finalAttrs.passthru.fix-links ../../CONTRIBUTING.md;
+  maintaining = finalAttrs.passthru.fix-links ../../MAINTAINING.md;
 
   buildPhase = ''
     mkdir -p $out
@@ -356,8 +357,10 @@ pkgs.stdenv.mkDerivation (finalAttrs: {
     mv ./docs/* ./ && rmdir ./docs
     mv ./mdbook/* ./ && rmdir ./mdbook
 
-    # Copy the contributing file
+    # Copy the contributing and maintaining files
     cp $contributing ./CONTRIBUTING.md
+    substitute $maintaining ./MAINTAINING.md \
+      --replace-fail 'This file' 'This page'
 
     # Symlink the function docs
     for path in ${lib-docs}/*