minor #2664 [Icons] Improve setup instructions (dbu)

This PR was merged into the 2.x branch.

Discussion
----------

[Icons] Improve setup instructions

| Q             | A
| ------------- | ---
| Bug fix?      | no
| New feature?  | no
| Docs?         | yes
| Issues        | https://symfony-devs.slack.com/archives/C01FN4EQNLX/p1743272426739939
| License       | MIT

i missed that i need the http-client installed, the bundle silently reduces functionality without it. i try to make it more clear what needs to be installed by mentioning the optional dependencies in the installation section, and by moving the http client hint to the "icon sets" section rather than having it in the middle of the syntax how to render icons.

Commits
-------

3d88215 improve setup instructions

Author: kbond

src/Icons/doc/index.rst

@@ -16,6 +16,15 @@ Installation
 
     $ composer require symfony/ux-icons
 
+HTTP Client for On-Demand Icons
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+If you plan to use provided icon sets, make sure that you have the HTTP client installed:
+
+.. code-block:: terminal
+
+    $ composer require symfony/http-client
+
 SVG Icons
 ---------
 
@@ -63,15 +72,6 @@ Loading Icons
        and embeds the downloaded SVG contents in the template #}
     {{ ux_icon('flowbite:user-solid') }}
 
-.. note::
-
-    To search and download icons via `ux.symfony.com/icons`_, the ``symfony/http-client``
-    package must be installed in your application:
-
-    .. code-block:: terminal
-
-        $ composer require symfony/http-client
-
 The ``ux_icon()`` function defines a second optional argument where you can
 define the HTML attributes added to the ``<svg>`` element:
 
@@ -87,6 +87,15 @@ define the HTML attributes added to the ``<svg>`` element:
 Icon Sets
 ~~~~~~~~~
 
+.. note::
+
+    To use icons from icon sets via `ux.symfony.com/icons`_, the ``symfony/http-client``
+    package must be installed in your application:
+
+    .. code-block:: terminal
+
+        $ composer require symfony/http-client
+
 There are many icon sets available, each with their own unique style and set of
 icons, providing a wide range of icons for different purposes, while maintaining
 a consistent look and feel across your application. Here are some of the most
@@ -166,7 +175,7 @@ HTML Syntax
 
 In addition to the ``ux_icon()`` function explained in the previous sections,
 this package also supports an alternative HTML syntax based on the ``<twig:ux:icon>``
-tag:
+tag if the ``symfony/ux-twig-component`` package is installed:
 
 .. code-block:: html