* 整理示例工程；更换图标；

Author: liwuqingxin

src/Nlnet.Sharp.Magic.App.Iconfont/Assets/icon_a.json

@@ -3,7 +3,7 @@
   "name": "tmp-旅行",
   "font_family": "travel",
   "css_prefix_text": "icon-",
-  "description": "",
+  "description": "https://www.iconfont.cn/collections/detail?spm=a313x.user_detail.i1.dc64b3430.7c873a81SACVae&cid=2352",
   "glyphs": [
     {
       "icon_id": "1337291",

src/Nlnet.Sharp.Magic.App.Iconfont/Assets/icon_b.json

@@ -3,7 +3,7 @@
   "name": "tpm-树木",
   "font_family": "tree",
   "css_prefix_text": "icon-",
-  "description": "",
+  "description": "https://www.iconfont.cn/collections/detail?spm=a313x.user_detail.i1.dc64b3430.2cf93a81wpRmyb&cid=2067",
   "glyphs": [
     {
       "icon_id": "1239661",

src/Nlnet.Sharp.Magic.App.Iconfont/Assets/icon_d.json

@@ -3,7 +3,7 @@
   "name": "临时项目-copy",
   "font_family": "iconfont",
   "css_prefix_text": "icon-",
-  "description": "",
+  "description": "https://www.iconfont.cn/collections/detail?spm=a313x.user_detail.i1.dc64b3430.63d53a81RbDwsw&cid=37310",
   "glyphs": [
     {
       "icon_id": "25997499",

src/Nlnet.Sharp.Magic.App.Iconfont/Assets/icon_e.json

@@ -3,7 +3,7 @@
   "name": "tmp-体育",
   "font_family": "sport",
   "css_prefix_text": "icon-",
-  "description": "",
+  "description": "https://www.iconfont.cn/collections/detail?spm=a313x.user_detail.i1.dc64b3430.59053a81HelXTH&cid=1911",
   "glyphs": [
     {
       "icon_id": "1190484",

src/Nlnet.Sharp.Magic.App/App.axaml

@@ -8,8 +8,14 @@
     </Application.Styles>
 
     <Application.Resources>
-        <!--This is not good because if you change the icon file's name or location, this goes wrong.-->
-        <FontFamily x:Key="IconAFamily">avares://Nlnet.Sharp.Magic.App.Iconfont/Assets/icon_a.ttf#travel</FontFamily>
+        <ResourceDictionary>
+            <ResourceDictionary.MergedDictionaries>
+                <ResourceInclude Source="avares://Nlnet.Avalonia.Senior/Assets/Themes.axaml" />
+            </ResourceDictionary.MergedDictionaries>
+            
+            <!--This is not good because if you change the icon file's name or location, this goes wrong.-->
+            <FontFamily x:Key="IconAFamily">avares://Nlnet.Sharp.Magic.App.Iconfont/Assets/icon_a.ttf#travel</FontFamily>
+        </ResourceDictionary>
     </Application.Resources>
 
 </Application>