Chore: Updated mat inputs to better match the style guide. Removed placeholders in favour of labels.

overlord/src/app/balance-sheet/balance-sheet.component.html

@@ -6,11 +6,11 @@
     <form [formGroup]="form" class="flex flex-col">
       <div class="flex flex-row justify-around content-start items-start sm:max-lg:flex-col">
         <mat-form-field class="flex-auto mr-5">
+          <mat-label>Date</mat-label>
           <input
             matInput
             [matDatepicker]="dateInput"
             (focus)="dateInput.open()"
-            placeholder="Date"
             formControlName="date"
             autocomplete="off"
           />