docs(theme): update theme

deprecated `lyTheme`

BREAKING CHANGE: for theming use LyThemeModule or MinimaThemeModule

To set a new theme you should import LyThemeModule

example:

LyThemeModule.setTheme('minima-dark')

examples for child theme:

Before:

```ts
@NgModule({
  ...
   LyCommonModule, // <-- theme, bg, color, raised & others
})
`

```html
<element lyTheme="minima-dark">
`

After:

import theme

```ts
@NgModule({
  ...
  LyCommonModule, // <-- bg, color, raised & others
  MinimaThemeModule // <-- themes
})
`

```html
<element ly-theme-minima-dark>
`

src/app/app.module.ts

@@ -33,6 +33,8 @@ import { CardDemoBasicModule } from '@docs/components/card-demo/card-demo-basic/
 import { LyTypographyModule } from '@alyle/ui/typography';
 import { TypographyDemoComponent } from '@docs/components/typography-demo/typography-demo.component';
 import { TypographyDemoBasicModule } from '@docs/components/typography-demo/typography-demo-basic/typography-demo-basic.module';
+import { MultipleThemesComponent } from './components/multiple-themes/multiple-themes.component';
+import { MultipleThemesDemo01Module } from './components/multiple-themes/multiple-themes-demo-01/multiple-themes-demo-01.module';
 
 const Quepal = {
   default: `linear-gradient(135deg,#11998e 0%,#38ef7d 100%)`,
@@ -70,6 +72,8 @@ export class MyCustomTheme extends LyThemeConfig {
   declarations: [
     AppComponent,
     TitleComponent,
+    /** Customization */
+    MultipleThemesComponent,
     /** Getting started */
     InstallationComponent,
     /** Components */
@@ -78,12 +82,14 @@ export class MyCustomTheme extends LyThemeConfig {
   ],
   imports: [
     BrowserModule.withServerTransition({appId: '@alyle/ui'}),
+    /** Customization */
+    /** MultipleThemes >*/MultipleThemesDemo01Module,
     /** Layout */
     GridDemoModule,
     FlexDemoModule,
     ResponsiveDemoModule,
-    /** CardDemo > **/CardDemoBasicModule,
-    /** TypographyDemo > **/TypographyDemoBasicModule,
+    /** CardDemo > */CardDemoBasicModule,
+    /** TypographyDemo > */TypographyDemoBasicModule,
     CommonModule,
     FormsModule,
     HttpClientModule,

src/app/app.routing.ts

@@ -4,11 +4,12 @@ import { HomeModule } from './home/home.module';
 import { InstallationComponent } from '@docs/getting-started/installation/installation.component';
 import { CardDemoComponent } from '@docs/components/card-demo/card-demo.component';
 import { TypographyDemoComponent } from '@docs/components/typography-demo/typography-demo.component';
+import { MultipleThemesComponent } from './components/multiple-themes/multiple-themes.component';
 
 const routes: Routes = [
   /** Customization */
   { path: 'customization/theming', loadChildren: './components/theming/theming.module#ThemingModule' },
-  { path: 'customization/multiple-themes', loadChildren: './components/multiple-themes/multiple-themes.module#MultipleThemesModule' },
+  { path: 'customization/multiple-themes', component: MultipleThemesComponent },
   { path: 'customization/bg-color', loadChildren: './components/bg-color-demo/bg-color-demo.module#BgColorDemoModule' },
   /** Components */
   {