Release 1.0

[chriswilty]

Time to release version 1.0, now the main team are moving onto other things.

Note that we may want to release a patch version shortly after, with all vulnerabilities tackled. For example, langchain lib is on an old 0.0.* version and we should be using latest 0.1.* now, but that could involve breaking changes, so we'll do it after the major release.