newsletter: explicit link to itself, instead of just '#'

newsletter/2022-10/2022-10-HIFIS-Newsletter.md

@@ -216,7 +216,7 @@ Discover the Helmholtz IT Services for Science!
 <table class="m--button" style="border-collapse:separate;" cellspacing="0" cellpadding="0" border="0">
 <tbody><tr>
 <td style="-moz-border-radius:20px;-webkit-border-radius:20px;border-radius:20px; border:2px solid #ffffff;font-size:12px;padding:3px 9px;" bgcolor="#005aa0" align="center">
-<a class="fallback-buttonfont" href="#" target="_blank" style="font-size:12px;line-height:18px;padding:3px 9px;font-weight:bold;font-family:'Open Sans', Arial, Helvetica, sans-serif;color:#ffffff;text-decoration: none;-moz-border-radius:20px;-webkit-border-radius:20px;border-radius:20px;display:block;">
+<a class="fallback-buttonfont" href="{% link newsletter/2022-10/2022-10-HIFIS-Newsletter.md %}" target="_blank" style="font-size:12px;line-height:18px;padding:3px 9px;font-weight:bold;font-family:'Open Sans', Arial, Helvetica, sans-serif;color:#ffffff;text-decoration: none;-moz-border-radius:20px;-webkit-border-radius:20px;border-radius:20px;display:block;">
 <span style="color: #ffffff;"><!--[if mso]>&nbsp;<![endif]-->October 2022<!--[if mso]>&nbsp;<![endif]--></span>
 </a>
 </td>