CHANGELOG.md had fallen behind theta-env's own tags -- entries
stopped at 1.1.3 despite v1.1.4/v1.1.5/v1.1.6 already being tagged
and released (each with real notes on GitHub, just never copied back
into this file). Backfilled 1.1.4-1.1.6 from the actual release
notes, then added 1.1.7 for this bump + the docs site redesign.
- proxy -> v1.1.7
- sso-manager-node -> v1.1.6
Adds a Keep-a-Changelog-style CHANGELOG.md, linked from README and
docs/index.md, closing the "no changelog or versioning scheme"
issue. Bumps proxy and sso-manager-node to v1.1.3 (both add their
own CHANGELOG.md, served in-app at /docs/changelog).
wmantly