Chore: Upgraded to angular 15

Chore: Moved from angular/flex-layout to Tailwind
Chore: Upgrade completed

overlord/src/app/settings/settings.component.html

@@ -1,6 +1,6 @@
 <mat-tab-group>
   <mat-tab label="Lock Dates">
-    <mat-card>
+    <mat-card appearance="outlined">
       <mat-card-content>
         <form [formGroup]="lockInfoForm" class="flex flex-col">
           <div class="flex flex-row justify-around content-start items-start sm:max-lg:flex-col">
@@ -190,7 +190,7 @@
     </mat-card>
   </mat-tab>
   <mat-tab label="Rebase Data">
-    <mat-card>
+    <mat-card appearance="outlined">
       <mat-card-content>
         <form [formGroup]="rebaseDataForm" class="flex flex-col">
           <div class="flex flex-row justify-around content-start items-start sm:max-lg:flex-col">
@@ -221,7 +221,7 @@
     </mat-card>
   </mat-tab>
   <mat-tab label="Maintenance Mode">
-    <mat-card>
+    <mat-card appearance="outlined">
       <mat-card-content>
         <mat-card-subtitle *ngIf="maintenance.enabled">
           Maintenance mode is <strong>ENABLED</strong> by user