Doc: lighten README.md for Webpages

.#README.md

README.md

documentations/.#mkdocs.yaml

documentations/en/index.md

documentations/en/pages/acknowledgements.md

documentations/en/pages/afroscreen.md

documentations/en/pages/configurations.md

documentations/en/pages/contributions.md

documentations/en/pages/features.md

documentations/en/pages/glossary.md

documentations/en/pages/installations.md

documentations/en/pages/results.md

documentations/en/pages/usage.md

documentations/fr/pages/acknowledgements.md

documentations/fr/pages/afroscreen.md

documentations/fr/pages/features.md

documentations/fr/pages/glossary.md

documentations/mkdocs.yaml