fix: backwards compatibility user configs + docs

doc/nvim-ts-context-commentstring.txt

@@ -72,13 +72,13 @@ With `nvim-treesitter` >= 1.0, use the `setup` function of this plugin:
 The following examples are for `nvim-treesitter` < 1.0, but they can easily be 
 adapted for `nvim-treesitter` >= 1.0.
 
-Support for more languages can be added quite easily by passing a `config` table
+Support for more languages can be added quite easily by passing a `languages` (formerly the now deprecated `config`) table
 when configuring the plugin:
 >lua
   require('nvim-treesitter.configs').setup {
     context_commentstring = {
       enable = true,
-      config = {
+      languages = {
         css = '// %s',
       },
     },
@@ -88,7 +88,7 @@ when configuring the plugin:
 Or with the `setup` function if using `nvim-treesitter` >= 1.0:
 >lua
   require('ts_context_commentstring').setup {
-    config = {
+    languages = {
       css = '// %s',
     },
   }
@@ -107,7 +107,7 @@ like:
   require('nvim-treesitter.configs').setup {
     context_commentstring = {
       enable = true,
-      config = {
+      languages = {
         javascript = {
           __default = '// %s',
           jsx_element = '{/* %s */}',
@@ -135,7 +135,7 @@ multi-line comment styles (useful when integrating with a commenting plugin):
   require('nvim-treesitter.configs').setup {
     context_commentstring = {
       enable = true,
-      config = {
+      languages = {
         typescript = { __default = '// %s', __multiline = '/* %s */' },
       },
     },

lua/ts_context_commentstring/config.lua

@@ -96,7 +96,7 @@ M.config = {
     },
   },
 
-  ---@deprecated
+  ---@deprecated Use the languages configuration instead!
   config = {},
 }
 
@@ -119,7 +119,7 @@ end
 
 ---@return ts_context_commentstring.LanguagesConfig
 function M.get_languages_config()
-  return vim.tbl_extend('keep', M.config.languages, M.config.config)
+  return vim.tbl_deep_extend('force', M.config.languages, M.config.config)
 end
 
 return M