feat(preview): [DLCM-1890] manage preview of docx

• remove ngx-doc-viewer

https://issues.unige.ch/browse/DLCM-1890

Need to test with solidify branch solidify/solidify-frontend!41 (merged)

Need npm i

Reminder : Procedure to test solidify frontend branch

1. Pull dlcm and solidify branches
2. npm i on solidify (allow to retrieve required lib)
3. npm i on dlcm (allow to retrieve required lib)
4. npm run build-solidify on dlcm (allow to override solidify lib from nexus with local build)
5. npm run start on dlcm to run the app

Warning : Do not merge this branch before release solidify and increment solidify version in package json