Fix errors caused by ThemeService

src/main/java/cc/ryanc/halo/model/support/Theme.java

@@ -25,11 +25,6 @@ public class Theme implements Serializable {
      */
     private boolean hasOptions;
 
-    /**
-     * Is internal theme
-     */
-    private boolean isInternal;
-
     /**
      * Theme properties
      */

src/main/java/cc/ryanc/halo/service/impl/ThemeServiceImpl.java

@@ -145,7 +145,7 @@ public class ThemeServiceImpl implements ThemeService {
      */
     @Override
     public File getThemeBasePath() {
-        return new File(System.getProperties().getProperty("user.home"), ".halo/templates/themes");
+        return new File(System.getProperties().getProperty("user.home"), "halo/templates/themes");
     }
 
     /**

src/main/resources/templates/themes/material/theme.properties

@@ -0,0 +1,9 @@
+theme.id=material
+theme.name=Material
+theme.website=https://github.com/viosey/hexo-theme-material
+theme.description=Nature, Pure | 原质，纯粹
+theme.logo=https://avatars0.githubusercontent.com/u/8141232?s=460&v=4
+theme.version=1.0
+theme.author=Viosey
+theme.author.website=https://viosey.com/
+