feat(completion): add supermaven-nvim

lua/astrocommunity/completion/supermaven-nvim/README.md

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+# supermaven-nvim
+
+> [!NOTE]
+> You should probably read their [Code Policy](https://supermaven.com/code-policy) before running this plugin, if code retention concerns you.
+
+The official Neovim plugin for [Supermaven](https://supermaven.com).
+
+Upon startup, you will be prompted to either use the Free Tier with the command `:SupermavenUseFree` or to activate a Supermaven Pro subscription by following a link, which will connect your Supermaven account.
+
+Keybinds:
+
+- Accept suggestion: `<C-l>`
+- Clear suggestion: `<C-h>`
+- Accept word: `<C-w>`
+
+**Repository**: <https://github.com/supermaven-inc/supermaven-nvim>

lua/astrocommunity/completion/supermaven-nvim/init.lua

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+return {
+  "supermaven-inc/supermaven-nvim",
+  event = "VeryLazy",
+  config = function()
+    require("supermaven-nvim").setup {
+      keymaps = {
+        accept_suggestion = "<C-l>",
+        clear_suggestion = "<C-h>",
+        accept_word = "<C-w>",
+      },
+      log_level = "warn",
+      disable_inline_completion = false, -- disables inline completion for use with cmp
+      disable_keymaps = false, -- disables built in keymaps for more manual control
+    }
+  end,
+}