fix: reload of the background by calling the background in the appcomponent

src/app/app.component.html

-<router-outlet></router-outlet>
\ No newline at end of file
+<router-outlet>
+  <app-background class="background"></app-background>
+</router-outlet>

src/app/components/about-me/about-me.component.html

-<app-background class="background"></app-background>
 <div class="wholeScreen">
     <app-header></app-header>
     <div class="restOfScreen">

src/app/components/contact/contact.component.html

-<app-background></app-background>
 <div class="wholeScreen">
   <app-header></app-header>
   <div class="restOfScreen">

src/app/components/home/home.component.html

-<app-background></app-background>
 <div class="wholeScreen">
     <app-header></app-header>
     <div class="restOfScreen">

src/app/components/impressum/impressum.component.html

-<app-background></app-background>
 <div class="wholeScreen">
   <app-header></app-header>
   <div class="restOfScreen">

src/app/components/page-not-found/page-not-found.component.html

-<app-background class="background"></app-background>
 <div class="wholeScreen">
     <app-header></app-header>
 

src/app/components/projects/projects.component.html

-<app-background></app-background>
 <div class="wholeScreen">
   <app-header></app-header>
   <div class="restOfScreen">

src/app/components/skills/skills.component.html

-<app-background></app-background>
 <div class="wholeScreen">
   <app-header></app-header>
   <div class="restOfScreen">