feat(motion): add move plugin flash nvim (#340)

lua/astrocommunity/motion/flash-nvim/README.md

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+# flash.nvim
+
+`flash.nvim` lets you navigate your code with search labels, enhanced character motions, and Treesitter integration.
+
+**Repository:** <https://github.com/folke/flash.nvim>
+
+## ✨ Features
+
+- 🔍 **Search Integration**: integrate **flash.nvim** with your regular
+  search using `/` or `?`. Labels appear next to the matches,
+  allowing you to quickly jump to any location. Labels are
+  guaranteed not to exist as a continuation of the search pattern.
+- ⌨️ **type as many characters as you want** before using a jump label.
+- ⚡ **Enhanced `f`, `t`, `F`, `T` motions**
+- 🌳 **Treesitter Integration**: all parents of the Treesitter node
+  under your cursor are highlighted with a label for quick selection
+  of a specific Treesitter node.
+- 🎯 **Jump Mode**: a standalone jumping mode similar to search
+- 🔎 **Search Modes**: `exact`, `search` (regex), and `fuzzy` search modes
+- 🪟 **Multi Window** jumping
+- 🌐 **Remote Actions**: perform motions in remote locations
+- ⚫ **dot-repeatable** jumps
+- 📡 **highly extensible**: check the [examples](https://github.com/folke/flash.nvim#-examples)

lua/astrocommunity/motion/flash-nvim/init.lua

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+return {
+  "folke/flash.nvim",
+  event = "VeryLazy",
+  vscode = true,
+  opts = {},
+  keys = {
+    {
+      "s",
+      mode = { "n", "x", "o" },
+      function() require("flash").jump() end,
+      desc = "Flash",
+    },
+    {
+      "S",
+      mode = { "n", "o", "x" },
+      function() require("flash").treesitter() end,
+      desc = "Flash Treesitter",
+    },
+    {
+      "r",
+      mode = "o",
+      function() require("flash").remote() end,
+      desc = "Remote Flash",
+    },
+    {
+      "R",
+      mode = { "o", "x" },
+      function() require("flash").treesitter_search() end,
+      desc = "Treesitter Search",
+    },
+  },
+}