Merge pull request #152 from ESA-APEx/fix_portal_footer_docs

fix: fixed missing image reference

Author: JanssenBrm

…project_portal/images/footer_socials.PNG …_portal/images/footer_socials_config.pngguides/project_portal/images/footer_socials.PNG renamed to guides/project_portal/images/footer_socials_config.png guides/project_portal/images/footer_socials.PNG renamed to guides/project_portal/images/footer_socials_config.png

@@ -44,6 +44,6 @@ After adding or changing links click **save configuration** to save and publish
 
 ![Footer - Footer first](../images/footer_menu_first.png){group="gallery-footer"}
 
-![Footer - Socials](../images/footer_socials.png){group="gallery-footer"}
+![Footer - Socials](../images/footer_socials_config.png){group="gallery-footer"}
 
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