add custom email templates

qdrant-landing/static/admin/emails/confirmation.html

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+<h2>Confirm your signup</h2>
+
+<p>Follow this link to confirm your user:</p>
+<p><a href="{{ .SiteURL }}/admin/#confirmation_token={{ .Token }}">Confirm your mail</a></p>

qdrant-landing/static/admin/emails/email_change.html

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+<h2>Confirm Change of Email</h2>
+
+<p>
+  Follow this link to confirm the update of your email from 
+  {{ .Email }} to {{ .NewEmail }}:
+</p>
+<p><a href="{{ .SiteURL }}/admin/#email_change_token={{ .Token }}">Change Email</a></p>

qdrant-landing/static/admin/emails/invite.html

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+<h2>You have been invited</h2>
+
+<p>
+  You have been invited to create a user on {{ .SiteURL }}. Follow
+  this link to accept the invite:
+</p>
+<p><a href="{{ .SiteURL }}/admin/#invite_token={{ .Token }}">Accept the invite</a></p>

qdrant-landing/static/admin/emails/recovery.html

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+<h2>Reset Password</h2>
+
+<p>Follow this link to reset the password for your user:</p>
+
+<p><a href="{{ .SiteURL }}/admin/#recovery_token={{ .Token }}">Reset Password</a></p>