Added light & dark theme. Basic theme applied on dialogs/modals. Attempt to apply uniformity to the website.

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

@@ -18,6 +18,7 @@
 
 .mat-mdc-card-content {
   align-self: center;
+  justify-content: space-between;
 }
 
 a {

src/app/auth/tts-login/tts-login.component.html

@@ -16,7 +16,7 @@
         </mat-select>
       </mat-form-field>
     </mat-card-content>
-    <mat-card-actions align="end">
+    <mat-card-actions>
       <button mat-raised-button
               (click)="login()">Log In</button>
     </mat-card-actions>

src/app/auth/user-card/user-card.component.html

@@ -8,8 +8,7 @@
     <mat-card-content>
       <impersonation />
     </mat-card-content>
-    <mat-card-actions class="actions"
-                      align="end">
+    <mat-card-actions class="actions">
       <div>
         @if (isTTSLoggedIn) {
         <button mat-raised-button