Chore: Upgraded to angular 15

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

overlord/src/app/period/period-detail/period-detail.component.html

@@ -1,7 +1,7 @@
-<mat-card>
-  <mat-card-title-group>
+<mat-card class="lg:max-w-[50%]">
+  <mat-card-header>
     <mat-card-title>Period</mat-card-title>
-  </mat-card-title-group>
+  </mat-card-header>
   <mat-card-content>
     <form [formGroup]="form" class="flex flex-col">
       <div class="flex flex-row justify-around content-start items-start">
@@ -33,7 +33,7 @@
     </form>
   </mat-card-content>
   <mat-card-actions>
-    <button mat-raised-button color="primary" (click)="save()">Save</button>
+    <button mat-raised-button color="primary" (click)="save()" class="mr-5">Save</button>
     <button mat-raised-button color="warn" (click)="confirmDelete()" *ngIf="!!item.id">
       Delete
     </button>

overlord/src/app/period/period-list/period-list.component.html

@@ -1,11 +1,13 @@
 <mat-card>
-  <mat-card-title-group>
-    <mat-card-title>Periods</mat-card-title>
-    <a mat-button [routerLink]="['/periods', 'new']">
-      <mat-icon>add_box</mat-icon>
-      Add
-    </a>
-  </mat-card-title-group>
+  <mat-card-header>
+    <mat-card-title-group>
+      <mat-card-title>Periods</mat-card-title>
+      <a mat-button [routerLink]="['/periods', 'new']">
+        <mat-icon>add_box</mat-icon>
+        Add
+      </a>
+    </mat-card-title-group>
+  </mat-card-header>
   <mat-card-content>
     <mat-table #table [dataSource]="dataSource" aria-label="Elements">
       <!-- Valid From Column -->

overlord/src/app/period/period.module.ts

@@ -6,12 +6,8 @@ import { MomentDateAdapter } from '@angular/material-moment-adapter';
 import { MatButtonModule } from '@angular/material/button';
 import { MatCardModule } from '@angular/material/card';
 import { MatCheckboxModule } from '@angular/material/checkbox';
-import {
-  DateAdapter,
-  MAT_DATE_FORMATS,
-  MAT_DATE_LOCALE,
-  MatOptionModule,
-} from '@angular/material/core';
+import { DateAdapter, MAT_DATE_FORMATS, MAT_DATE_LOCALE } from '@angular/material/core';
+import { MatOptionModule } from '@angular/material/core';
 import { MatDatepickerModule } from '@angular/material/datepicker';
 import { MatDialogModule } from '@angular/material/dialog';
 import { MatIconModule } from '@angular/material/icon';