feat(keybinding): add nvcheatsheet.nvim (#861)

lua/astrocommunity/keybinding/nvcheatsheet-nvim/README.md

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+# nvcheatsheet.nvim
+
+NvChad cheatsheet as a standalone neovim plugin
+
+**Repository:** <https://github.com/smartinellimarco/nvcheatsheet.nvim>

lua/astrocommunity/keybinding/nvcheatsheet-nvim/init.lua

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+return {
+  "smartinellimarco/nvcheatsheet.nvim",
+  lazy = true,
+  dependencies = {
+    {
+      "AstroNvim/astrocore",
+      opts = {
+        mappings = {
+          n = {
+            ["<F1>"] = { function() require("nvcheatsheet").toggle() end, desc = "Cheatsheet" },
+          },
+        },
+      },
+    },
+  },
+  opts = function(_, opts)
+    local mappings = vim.tbl_get(require("astrocore").plugin_opts "astrocore", "mappings", "n")
+    if mappings then
+      local heading_desc = { [""] = "General" }
+      if not opts.keymaps then opts.keymaps = {} end
+      for lhs, rhs in pairs(mappings) do
+        if type(rhs) == "table" then
+          local cmd, desc = rhs[1], rhs.name or rhs.desc
+          if desc and not cmd then heading_desc[lhs] = desc end
+        end
+      end
+      local headings = vim.tbl_keys(heading_desc)
+      for lhs, rhs in pairs(mappings) do
+        if type(rhs) == "table" then
+          local cmd, desc = rhs[1], rhs.name or rhs.desc
+          if desc and cmd then
+            local matched_heading = ""
+            for _, heading in ipairs(headings) do
+              if lhs:sub(1, #heading) == heading then
+                if #heading > #matched_heading then matched_heading = heading end
+              end
+            end
+            local heading = heading_desc[matched_heading]
+            if not opts.keymaps[heading] then opts.keymaps[heading] = {} end
+            table.insert(opts.keymaps[heading], { desc, lhs })
+          end
+        end
+      end
+    end
+  end,
+}