feat(git): Add gist-nvim (#668)

Co-authored-by: gacallea <[email protected]>

lua/astrocommunity/git/gist-nvim/README.md

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+# gist-nvim
+
+gist.nvim is a Neovim plugin that allows you to create a GitHub Gist from the
+current file. The plugin uses the gh command-line tool to create the Gist and
+provides a simple interface for specifying the Gist's description and privacy
+settings.
+
+**Repository** <https://github.com/rawnly/gist.nvim>
+
+Requirements:
+
+- `gh` [command-line tool](https://cli.github.com) to create the Gist.

lua/astrocommunity/git/gist-nvim/init.lua

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+return {
+  {
+    "Rawnly/gist.nvim",
+    dependencies = {
+      {
+        "samjwill/nvim-unception",
+        lazy = false,
+        init = function() vim.g.unception_block_while_host_edits = true end,
+      },
+    },
+    cmd = { "GistCreate", "GistCreateFromFile", "GistsList" },
+    config = function()
+      require("gist").setup {
+        private = false,
+        clipboard = "+",
+        list = {
+          -- If there are multiple files in a gist you can scroll them,
+          -- with vim-like bindings n/p next previous
+          mappings = {
+            next_file = "<C-n>",
+            prev_file = "<C-p>",
+          },
+        },
+      }
+    end,
+  },
+}