add link to wikipage and add further details

.gitlab/issue_templates/institute_logo.md

 ### Institute Logo Document Class
 
-The following checklist should be used to add institute logos to the repository.  
+The following checklist should be used to add institute logos to the repository, see the [wikipage](https://collaborating.tuhh.de/e-4/tuhh_latex_presentation/-/wikis/Slides-with-Institute-Logos) on adding logos for details.
+
 Please follow the checklist and use the provided template files to get correct spacings and sizes in the logos.
 
-Checklist:
-- [ ] Added titlepage logo version to be placed next to the TUHH wordmark (Path: `.theme_imgs/x0_logo_titlepage.pdf`)
+#### Checklist
+
+- [ ] Added title page logo version to be placed next to the TUHH wordmark (Path: `.theme_imgs/x0_logo_titlepage.pdf`)
 - [ ] Added content logo version to be placed in the top right corner of content slides (Path: `.theme_imgs/x0_logo_content.pdf`)
-- [ ] Added document class option and template configuration
+- [ ] Added document class option and template configuration to `tuhh_presentation.cls`
     ```
     % Institute Name (x0)
     \DeclareOption{x0}{%
@@ -14,4 +16,4 @@ Checklist:
     }
     ```
 - [ ] Checked correct document generation
-- [ ] Assign this merge request to the current maintainer
+- [ ] Assigned this merge request to the current maintainer