perf: reduce background image sizes to improve performance

frontend/src/app/components/auth/forgot-password/forgot-password.component.scss

@@ -3,5 +3,5 @@
 
 section {
   background-image: linear-gradient(rgba(0, 0, 0, 0.3), rgba(0, 0, 0, 0.3)),
-    url(./../../../../assets/img/backgrounds/login.png);
+    url(./../../../../assets/img/backgrounds/login.jpeg);
 }

frontend/src/app/components/auth/landing-page/landing-page.component.scss

@@ -4,7 +4,7 @@
 
 section {
   background-image: linear-gradient(rgba(0, 0, 0, 0.4), rgba(0, 0, 0, 0.4)),
-    url(./../../../../assets/img/backgrounds/home.png);
+    url(./../../../../assets/img/backgrounds/home.jpeg);
 }
 
 .headline {

frontend/src/app/components/auth/login/login.component.scss

@@ -5,7 +5,7 @@
 
 section {
   background-image: linear-gradient(rgba(0, 0, 0, 0.3), rgba(0, 0, 0, 0.3)),
-    url(./../../../../assets/img/backgrounds/login.png);
+    url(./../../../../assets/img/backgrounds/login.jpeg);
 }
 
 .content {

frontend/src/app/components/auth/register/register.component.scss

@@ -4,5 +4,5 @@
 
 section {
   background-image: linear-gradient(rgba(0, 0, 0, 0.3), rgba(0, 0, 0, 0.3)),
-    url(./../../../../assets/img/backgrounds/register.png);
+    url(./../../../../assets/img/backgrounds/register.jpeg);
 }

frontend/src/app/components/auth/verify-email/verify-email.component.scss

@@ -3,5 +3,5 @@
 
 section {
   background-image: linear-gradient(rgba(0, 0, 0, 0.6), rgba(0, 0, 0, 0.6)),
-    url(./../../../../assets/img/backgrounds/login.png);
+    url(./../../../../assets/img/backgrounds/login.jpeg);
 }