replacing hard coded links for ela.st (#72240) (#72253)

Co-authored-by: Cauê Marcondes <55978943+cauemarcondes@users.noreply.github.com>

Author: sorenlouv

x-pack/plugins/observability/public/components/app/header/index.tsx

@@ -69,10 +69,7 @@ export const Header = ({
           </EuiFlexItem>
           {showGiveFeedback && (
             <EuiFlexItem style={{ alignItems: 'flex-end' }} grow={false}>
-              <EuiButtonEmpty
-                href={'https://discuss.elastic.co/c/observability/'}
-                iconType="popout"
-              >
+              <EuiButtonEmpty href={'https://ela.st/observability-discuss'} iconType="popout">
                 {i18n.translate('xpack.observability.home.feedback', {
                   defaultMessage: 'Give us feedback',
                 })}

x-pack/plugins/observability/public/components/app/ingest_manager_panel/index.tsx

@@ -40,7 +40,7 @@ export const IngestManagerPanel = () => {
           </EuiText>
         </EuiFlexItem>
         <EuiFlexItem>
-          <EuiLink href="https://www.elastic.co/blog/introducing-elastic-agent-and-ingest-manager">
+          <EuiLink href="https://ela.st/ingest-manager-announcement">
             {i18n.translate('xpack.observability.ingestManafer.button', {
               defaultMessage: 'Try Ingest Manager Beta',
             })}

x-pack/plugins/observability/public/components/app/resources/index.tsx

@@ -13,21 +13,21 @@ const resources = [
     label: i18n.translate('xpack.observability.resources.documentation', {
       defaultMessage: 'Documentation',
     }),
-    href: 'https://www.elastic.co/guide/en/observability/current/observability-ui.html',
+    href: 'https://ela.st/observability-documentation',
   },
   {
     iconType: 'editorComment',
     label: i18n.translate('xpack.observability.resources.forum', {
       defaultMessage: 'Discuss forum',
     }),
-    href: 'https://discuss.elastic.co/c/observability/',
+    href: 'https://ela.st/observability-discuss',
   },
   {
     iconType: 'training',
     label: i18n.translate('xpack.observability.resources.training', {
       defaultMessage: 'Observability fundamentals',
     }),
-    href: 'https://www.elastic.co/training/observability-fundamentals',
+    href: 'https://ela.st/observability-training',
   },
 ];