chore(docs): improve doc/configurations markdown files readability

doc/configurations/custom_buttons.md

@@ -1,8 +1,10 @@
-# Custom `QuillToolbar` Buttons
+# Custom QuillToolbar Buttons ✨
 
 You may add custom buttons to the _end_ of the toolbar, via the `customButtons` option, which is a `List`
 of `QuillToolbarCustomButtonOptions`.
 
+## Adding an Icon 🖌️
+
 To add an Icon, we should use a new `QuillToolbarCustomButtonOptions` class
 
 ```dart
@@ -14,6 +16,8 @@ To add an Icon, we should use a new `QuillToolbarCustomButtonOptions` class
       ),
 ```
 
+## Example Usage 📚
+
 Each `QuillCustomButton` is used as part of the `customButtons` option as follows:
 
 ```dart

doc/configurations/font_size.md

@@ -1,4 +1,4 @@
-# Font Size
+# 🔠 Font Size
 
 Within the editor toolbar, a drop-down with font-sizing capabilities is available.
 This can be enabled or disabled

doc/configurations/localizations_setup.md

@@ -1,8 +1,6 @@
-# Localizations Setup
+# 🌍 Localizations Setup
 
-in addition to the required delegates mentioned above in [Using custom app widget](./using_custom_app_widget.md)
-
-which are:
+In addition to the required delegates mentioned above in [Using custom app widget](./using_custom_app_widget.md), which are:
 
 ```dart
 localizationsDelegates: const [
@@ -12,21 +10,15 @@ localizationsDelegates: const [
 ],
 ```
 
-which are used by official Flutter widgets
+Which are used by Flutter widgets.
 
-The library also needs the `FlutterQuillLocalizations.delegate`
+📌 Note: The library also needs the `FlutterQuillLocalizations.delegate`:
 
 ```dart
 // Required localizations delegates ...
 FlutterQuillLocalizations.delegate
 ```
 
-To offer the default localizations.
-
-But **you don't have to** since we have wrapped the `QuillEditor` and `QuillToolbar`
-with `FlutterQuillLocalizationsWidget` which will check if it sets then it will go, if not, then it will be provided
-only for them, so it's not really required, but if you are overriding the `localizationsDelegates` you could also add
-the `FlutterQuillLocalizations.delegate`
-which won't change anything
+**You don't have to add this explicitly** because we have wrapped the `QuillEditor` and `QuillToolbar` with `FlutterQuillLocalizationsWidget`. This widget will check if the necessary localizations are set; if not, it will provide them only for these widgets. Therefore, it's not strictly required. However, if you are overriding the `localizationsDelegates`, you can also add the `FlutterQuillLocalizations.delegate`.
 
-There are additional notes in the [Translation](../translation.md) section
+📄 For additional notes, refer to the [Translation](../translation.md) section.

doc/configurations/using_custom_app_widget.md

@@ -1,14 +1,12 @@
-# Using Custom App Widget
+# 🛠️ Using Custom App Widget
 
-This project uses some adaptive widgets like `AdaptiveTextSelectionToolbar` which require the following delegates:
+The project uses some adaptive widgets like `AdaptiveTextSelectionToolbar` which require the following delegates:
 
 1. Default Material Localizations delegate
 2. Default Cupertino Localizations delegate
 3. Default Widgets Localizations delegate
 
-You don't need to include those since they are defined by default
-but if you are using a Custom app or you are overriding the `localizationsDelegates` in the App widget
-then please make sure it includes those:
+You don't need to include these since they are defined by default. However, if you are using a custom app or overriding the `localizationsDelegates` in the App widget, ensure it includes the following:
 
 ```dart
 localizationsDelegates: const [
@@ -18,9 +16,8 @@ localizationsDelegates: const [
 ],
 ```
 
-You might need more depending on your use case, for example, if you are using custom localizations for your app, using a
-custom app widget like `FluentApp` from [FluentUI]
-which will also need
+
+You might need more depending on your use case. For example, if you are using custom localizations for your app with a custom app widget like `FluentApp` from [FluentUI], you will also need:
 
 ```dart
 localizationsDelegates: const [
@@ -30,9 +27,8 @@ localizationsDelegates: const [
 ],
 ```
 
-Note: In the latest versions of `FluentApp` you no longer need to add the `localizationsDelegates` but this is just an
-example, for more [info](https://github.com/bdlukaa/fluent_ui/pull/946)
+📌 Note: In recent versions of `FluentApp`, you no longer need to add the `localizationsDelegates`. This is just an example. For more information, refer to the [#946](https://github.com/bdlukaa/fluent_ui/pull/946).
 
-There are additional notes on the [Localizations](./localizations_setup.md) page
+📄 For additional notes, see the [Localizations](./localizations_setup.md) page.
 
 [FluentUI]: https://pub.dev/packages/fluent_ui