syntax correction to avoid preview error (#14962)

Signed-off-by: Toshaan Bharvani <toshaan@vantosh.com>
Co-authored-by: Yvo <yvo.vandoorn@gmail.com>

Author: toshywoshy

themes/devopsdays-theme/layouts/shortcodes/asset.html

@@ -12,6 +12,6 @@
 
 {{- if ne $image "" -}}
 
-<img src = "https:/assets.devopsdays.org/events/{{- $year -}}/{{- $city -}}/{{- $image -}}" class = "img-fluid" alt="{{- $name -}}">
+<img src = "https://assets.devopsdays.org/events/{{- $year -}}/{{- $city -}}/{{- $image -}}" class = "img-fluid" alt="{{- $name -}}">
 
 {{- end -}}