feat: update ai.nvim dependency and improve doc

- Updated ai.nvim dependency version to >=1.3.0 in README.md and doc/dante.txt.
- Improved documentation in doc/dante.txt:
  - Removed recommendation to use a plugin manager.
  - Added `layout` option description.
  - Removed `verbose` option description.

README.md

@@ -49,7 +49,7 @@ You can install dante.nvim using your preferred plugin manager. Here's an exampl
     },
   },
   dependencies = {
-    { "S1M0N38/ai.nvim", version = ">=1.1.0" },
+    { "S1M0N38/ai.nvim", version = ">=1.3.0" },
   }
 }
 ```

doc/dante.txt

@@ -12,8 +12,8 @@ Table of contents:
 ================================================================================
 SETUP                                                            *dante-setup*
 
-It's highly recommended to use a plugin manager to install dante.nvim. For
-example, using `lazy.nvim`:
+It's recommended to use a plugin manager to install dante.nvim. For example,
+using `lazy.nvim`:
 
 >lua
     {
@@ -32,7 +32,7 @@ example, using `lazy.nvim`:
         }
       }
       dependencies = {
-        { "S1M0N38/ai.nvim", version=">=1.1.0" },
+        { "S1M0N38/ai.nvim", version = ">=1.3.0" },
       }
     }
 <
@@ -67,9 +67,8 @@ dante.setup({opts}) ~
 
 >lua
   {
-    -- Enable verbose notifications
     verbose = false,
-
+    layout = "right",
     presets = {
       ["default"] = {
         client = {
@@ -109,6 +108,9 @@ dante.setup({opts}) ~
   - `verbose`: If `true`, the plugin will notify you with extra information on
     completion.
 
+  - `layout`: In which direction open the new window for the generated text.
+    Can be "right", "left", "above" or "below".
+
   - `presets`: A list of presets. The preset `default` is the only preset
     available at the moment. You can craft various presets for various
     situations (e.g., just fix typos, refine an email, add emojis to a readme,