unstable by default

Switch back to using `nixpkgs-unstable` by default and using
`nixpkgs-2305` when needed, such as for `exa` which is no longer
maintained and available.

In a future commit, I'll switch to `eza` which is the recommended alternative.

https://github.com/eza-community/eza

system/shared/home-manager-packages.nix

@@ -7,7 +7,7 @@ with pkgs; [
   delta
   dog
   doppler
-  exa
+  inputs.nixpkgs-2305.legacyPackages."${system}".exa
   fd
   file
   fzf
@@ -18,7 +18,6 @@ with pkgs; [
   gnupg
   htop
   inotify-tools
-  inputs.nixpkgs-unstable.legacyPackages."${system}".rustywind
   jq
   just
   lua
@@ -39,6 +38,7 @@ with pkgs; [
   pv
   python3Full
   ripgrep
+  rustywind
   terraform
   tldr
   tmuxinator

system/shared/home-manager.nix

@@ -525,7 +525,6 @@ in
       customVim.vim-textobj-xmlattr
       customVim.vim-visual-star-search
 
-      inputs.nixpkgs-unstable.legacyPackages."${system}".vimPlugins.refactoring-nvim
       vimPlugins.comment-nvim
       vimPlugins.dial-nvim
       vimPlugins.gitsigns-nvim
@@ -533,6 +532,7 @@ in
       vimPlugins.impatient-nvim
       vimPlugins.indent-blankline-nvim
       vimPlugins.nvim-web-devicons
+      vimPlugins.refactoring-nvim
       vimPlugins.rest-nvim
       vimPlugins.splitjoin-vim
       vimPlugins.todo-comments-nvim
@@ -570,9 +570,9 @@ in
       vimPlugins.nvim-treesitter-textobjects
 
       # LSP
-      inputs.nixpkgs-unstable.legacyPackages."${system}".vimPlugins.nvim-lspconfig
-      vimPlugins.null-ls-nvim
       vimPlugins.lsp-status-nvim
+      vimPlugins.null-ls-nvim
+      vimPlugins.nvim-lspconfig
 
       # Completion
       vimPlugins.cmp-buffer
@@ -634,8 +634,8 @@ in
 
       # Language servers
       ansible-language-server
-      inputs.nixpkgs-unstable.legacyPackages."${system}".nixd
       lua-language-server
+      nixd
       nodePackages.intelephense
       nodePackages."@astrojs/language-server"
       nodePackages."@tailwindcss/language-server"