GitLab

popup texts revised; added a few terms - all for the purpose of making readers better understand texts.

updates of documentation - this commit has some bugs that are mentioned in (new) issues - starting from #16

added terms/figures such that we can actually see some difference in the architecture and other documents

ensure we can do some testing in accordance with https://gitlab.grnet.gr/essif-lab/framework/-/blob/feture-term-engine-v1/docs/terminology-plugin-instructions.md (but doesn't seem to work here)

updated terminology files to use %% rather than {{ ... }}; also, templates have been moved to their own dir