remove all content and edit CI

.gitlab-ci.yml

content/background.jpg

content/docs/List_Contributors.md

content/docs/Mindmap.md

content/docs/_index.md

content/docs/about.md

content/docs/agility/_index.md

content/docs/agility/development.md

content/docs/agility/frontiers.md

content/docs/agility/incentives.md

content/docs/agility/modalities.md

content/docs/agility/testing.md

content/docs/contributing.md

content/docs/libraries.md

content/docs/migration/_index.md

content/docs/migration/algorithms/_index.md

content/docs/migration/algorithms/all/bike.md

content/docs/migration/algorithms/all/dilithium.md

content/docs/migration/algorithms/all/falcon.md

content/docs/migration/algorithms/all/frodo.md