theme: add themes & load immediately to be selectable

`SPC f t` selector will choose from any theme that is loaded, including
all variants that a theme defines

Configure AstroNvim/astrotheme to load immediately, so that theme is
available as a selection

Add community themes set to lazy = false
- "astrocommunity.colorscheme.everforest"
- "astrocommunity.colorscheme.nightfox-nvim"
- "astrocommunity.colorscheme.kanagawa-nvim"
- "astrocommunity.colorscheme.github-nvim-theme"

Author: practicalli-johnny

plugins/community.lua

@@ -4,8 +4,6 @@ return {
   -- example of imporing a plugin, comment out to use it or add your own
   -- available plugins can be found at https://github.com/AstroNvim/astrocommunity
 
-  -- { import = "astrocommunity.colorscheme.catppuccin" },
-  -- { import = "astrocommunity.completion.copilot-lua-cmp" },
   { import = "astrocommunity.editing-support.todo-comments-nvim" },
 
   {
@@ -37,7 +35,5 @@ return {
   { import = "astrocommunity.project.project-nvim" }, -- very nice
 
   -- Themes
-  { import = "astrocommunity.colorscheme.nightfox" },          -- very nice
-  { import = "astrocommunity.colorscheme.everforest" },        -- very nice
-  { import = "astrocommunity.colorscheme.kanagawa" },          -- very nice
+  -- defined in themes.lua
 }

plugins/themes.lua

@@ -0,0 +1,36 @@
+-- Themes for AstroNvim
+-- aka colorscheme
+
+-- `SPC f t` selector shows all themes and their variants
+-- Themes are configured to disable lazy loading so they are selectable
+-- default theme is defined in `init.lua` using the `colorscheme` option
+
+return {
+  {
+    "AstroNvim/astrotheme", -- default AstroNvim theme
+    lazy = false,
+  },
+
+  -- Add the community repository of plugin specifications
+  "AstroNvim/astrocommunity",
+  { import = "astrocommunity.colorscheme.everforest" },
+  {
+    "sainnhe/everforest",
+    lazy = false,
+  },
+  { import = "astrocommunity.colorscheme.nightfox-nvim" },
+  {
+    "EdenEast/nightfox.nvim",
+    lazy = false,
+  },
+  { import = "astrocommunity.colorscheme.kanagawa-nvim" },
+  {
+    "rebelot/kanagawa.nvim",
+    lazy = false,
+  },
+  { import = "astrocommunity.colorscheme.github-nvim-theme" }, -- no background support
+  {
+    "projekt0n/github-nvim-theme",
+    lazy = false,
+  },
+}