feat(git): add mini.diff

Author: mehalter

lua/astrocommunity/git/mini-diff/README.md

@@ -0,0 +1,5 @@
+# mini.diff
+
+Work with diff hunks. Part of 'mini.nvim' library.
+
+**Repository:** <https://github.com/echasnovski/mini.diff>

lua/astrocommunity/git/mini-diff/init.lua

@@ -0,0 +1,26 @@
+---@type LazySpec
+return {
+  "echasnovski/mini.diff",
+  event = "User AstroGitFile",
+  opts = function()
+    local sign = require("astroui").get_icon "GitSign"
+    return {
+      view = {
+        style = "sign",
+        signs = { add = sign, change = sign, delete = sign },
+      },
+      mappings = {
+        apply = "gh",
+        goto_first = "[G",
+        goto_last = "]G",
+        goto_next = "]g",
+        goto_prev = "[g",
+        reset = "gH",
+        textobject = "g",
+      },
+    }
+  end,
+  specs = {
+    { "lewis6991/gitsigns.nvim", enabled = false },
+  },
+}