refactor(scripts): rename doc-gen script

scripts/docgen.lua

@@ -0,0 +1,28 @@
+---@diagnostic disable: undefined-global
+--# selene: allow(undefined_variable)
+
+local okay, minidoc = pcall(require, "mini.doc")
+if not okay then
+  error "mini.doc not found, please install it. https://github.com/echasnovski/mini.doc"
+  return
+end
+
+local files = {
+  "lua/gopher/init.lua",
+  "lua/gopher/config.lua",
+  "lua/gopher/impl.lua"
+}
+
+minidoc.setup()
+
+local hooks = vim.deepcopy(minidoc.default_hooks)
+hooks.write_pre = function(lines)
+  -- Remove first two lines with `======` and `------` delimiters to comply
+  -- with `:h local-additions` template
+  table.remove(lines, 1)
+  table.remove(lines, 1)
+
+  return lines
+end
+
+MiniDoc.generate(files, "doc/gopher.nvim.txt", { hooks = hooks })