updating general files

CONTRIBUTING.md

@@ -3,7 +3,6 @@
 The openMINDS metadata framework is an open-source project and community contributions are highly appreciated.  
 If you want to contribute please follow our :arrow_right: [**contribution guidelines**][contribution-url].
 
-
 <!-- MARKDOWN LINKS & IMAGES -->
 <!-- https://www.markdownguide.org/basic-syntax/#reference-style-links -->
 [contribution-url]: https://openminds-documentation.readthedocs.io/en/latest/shared/how_to_contribute.html

README.md

@@ -8,25 +8,26 @@
 
 # openMINDS_core
 
-![GitHub][license-url]
-![GitHub contributors][contributors-url]
-
+[![GitHub][license-shield]][license-url]
+[![GitHub contributors][contributors-shield]][contributors-url]
 
 The **openMINDS_core** repository hosts one of the metadata models of the **openMINDS metadata framework**. It defines modular metadata schemas for describing the general origin, location and content of neuroscience research products.
 
-To generally learn more about the openMINDS metadata framework please go to :arrow_right: [**ReadTheDocs**][docu-url].  
-Or explore directly the metadata schemas of the openMINDS_core metadata model under :arrow_right: [**Specifications**][docu-core-url].
+To generally learn more about the openMINDS metadata framework please go our :arrow_right: [**documentation**][docu-url].  
+Or explore directly the metadata schemas of the openMINDS_core metadata model under :arrow_right: [**schema specifications**][docu-core-url].
 
 ## How to contribute
 
 The openMINDS metadata framework is an open-source project and community contributions are highly appreciated.  
 If you want to contribute please follow our :arrow_right: [**contribution guidelines**][contribution-url].
 
-
 <!-- MARKDOWN LINKS & IMAGES -->
 <!-- https://www.markdownguide.org/basic-syntax/#reference-style-links -->
-[contribution-url]: https://openminds-documentation.readthedocs.io/en/latest/shared/how_to_contribute.html
-[contributors-url]: https://img.shields.io/github/contributors/openMetadataInitiative/openMINDS_core
+[contribution-url]: https://openminds-documentation.readthedocs.io/en/latest/shared/contribution_guidelines.html
+[contributors-url]: https://github.com/openMetadataInitiative/openMINDS_core/graphs/contributors
+[contributors-shield]: https://img.shields.io/github/contributors/openMetadataInitiative/openMINDS_core
 [docu-url]: https://openminds-documentation.readthedocs.io
-[docu-core-url]: https://openminds-documentation.readthedocs.io/en/v3.0/specifications/core.html
-[license-url]: https://img.shields.io/github/license/openMetadataInitiative/openMINDS_core
+[docu-core-url]: https://openminds-documentation.readthedocs.io/en/v3.0/schema_specifications/core.html
+[license-url]: https://raw.githubusercontent.com/openMetadataInitiative/openMINDS_core/v4/LICENSE
+[license-shield]: https://img.shields.io/github/license/openMetadataInitiative/openMINDS_core
+