feat(startup): add fsplash plugin

lua/astrocommunity/startup/fsplash-nvim/README.md

@@ -0,0 +1,7 @@
+# fsplash.nvim
+
+**Repository:** https://github.com/jovanlanik/fsplash.nvim
+
+Show a custom splash screen in a floating window
+
+**Note:** This plugin will also disable the Alpha dashboard by default

lua/astrocommunity/startup/fsplash-nvim/fsplash.lua

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+return {
+  { "goolord/alpha-nvim", enabled = false },
+  {
+    "jovanlanik/fsplash.nvim",
+    init = function()
+      vim.api.nvim_create_autocmd("VimEnter", {
+        desc = "Start fsplash when vim is opened with no arguments",
+        group = vim.api.nvim_create_augroup("fsplash_autostart", { clear = true }),
+        callback = function()
+          local should_skip = false
+          if vim.fn.argc() > 0 or vim.fn.line2byte(vim.fn.line "$") ~= -1 or not vim.o.modifiable then
+            should_skip = true
+          else
+            for _, arg in pairs(vim.v.argv) do
+              if arg == "-b" or arg == "-c" or vim.startswith(arg, "+") or arg == "-S" then
+                should_skip = true
+                break
+              end
+            end
+          end
+          if not should_skip then require("fsplash").open_window() end
+        end,
+      })
+    end,
+    opts = {
+      lines = {
+        "    ___         __             _   __      _         ",
+        "   /   |  _____/ /__________  / | / /   __(_)___ ___ ",
+        "  / /| | / ___/ __/ ___/ __ \\/  |/ / | / / / __ `__ \\",
+        " / ___ |(__  ) /_/ /  / /_/ / /|  /| |/ / / / / / / /",
+        "/_/  |_/____/\\__/_/   \\____/_/ |_/ |___/_/_/ /_/ /_/ ",
+      },
+      highlights = {
+        ["NormalFloat"] = { link = "Normal" },
+      },
+    },
+  },
+}