fixed spelling mistake, post button is now hidden when post is empty

src/app/components/about/about.component.html

@@ -8,7 +8,7 @@
 </div>
 <div id="text1" style="text-align: center;">
   <h1>What's Greenvironment?</h1>
-  <p class="mat-display-1">We, the greenviroment team want to create a netwok for environmentalists who care for our nature and our planet as much as we do.</p>
+  <p class="mat-display-1">We, the greenviroment team want to create a network for environmentalists who care for our nature and our planet as much as we do.</p>
 </div>
 <div id="text2" style="text-align: center;">
   <p class="mat-display-1">We believe, that together we can do amazing things to protect our environment and keep it clean and green.</p>

src/app/components/feed/feed.component.html

@@ -7,7 +7,7 @@
 <mat-card >      
   <mat-card-content>
   <mat-form-field id="input">
-    <textarea matInput #content type="text" mat-autosize="true" matAutosizeMaxRows="3" placeholder="post something"></textarea>
+    <textarea matInput #content type="text" [(ngModel)]="empty" mat-autosize="true" matAutosizeMaxRows="3" placeholder="post something"></textarea>
     <button mat-button matSuffix mat-icon-button>
       <mat-icon>add</mat-icon>
     </button>
@@ -24,7 +24,7 @@
       </mat-option>
     </mat-select>
   </mat-form-field>
-  <button mat-raised-button color="primary" id="post-button" (click)=createPost(content)>
+  <button mat-raised-button *ngIf="empty" color="primary" id="post-button" (click)=createPost(content)>
     POST
   </button>
 </mat-card-content>

src/app/components/feed/feed.component.ts

@@ -12,6 +12,7 @@ import { User } from 'src/app/models/user';
 })
 export class FeedComponent implements OnInit {
   checked: boolean; // if the "I protected the environment."-box is checked
+  empty: boolean;
  // points value of the green action
   value: any;
   viewNew = true;