[BUG]Update documentation

[prasadtalasila]

Describe the bug

The following documentation is out of date:

1. Client config. The REACT_APP_WORKBENCHLINK_DT_PREVIEW is missing in some places.
2. Each release must have fixed npm and docker versions in all places. At present, the npm install and custom docker compose files in client and servers do not have their versions fixed. In addition, the docs need to be updated as well.
3. Developer documentation needs to be updated for latest code of all the packages.
4. DevOps documentation from Vanessa's thesis need to be integrated
5. Port updates in documentation from release-v0.6 branch to feature/distributed-demo branch.

[prasadtalasila]

Libms has git mode and yaml config. This needs to be reflected in the docs

[prasadtalasila]

Documentation for preview/digitaltwins page

1. Integrate runner
2. Remember to have atleast one pipeline trigger token
3. Always have main branch. The Create and Manage DT tabs work on any default branch but Execute works only on branch with name as main.

[prasadtalasila]

Documentation for preview/library page

1. Have a dtaas group in the integrated gitlab instance
2. Have a gitlab repository in dtaas group with username as repository name. For example, user1 username must have a repository at https://foo.com/gitlab/dtaas/user1.git. Create a branch named main and make this the default branch.
3. Create a PAT - personal access token with a name, for example your username (say user1).
4. Use it to clone and work with the repository. The repository will be accessible using the URL: https://<PAT-name>:<token-value>:foo.com/gitlab/dtaas/user1.git. Use regular git workflows for commit, push and pull content.
5. Remember to create a branch named main and push content to the same. Now the workflows from React website and the git are synchronized.