feat: CMD-164 migrate from _cms to _assets

[wesleyboar]

Overview

Migrate some _cms configurations to just an _assets directory (via PORTAL_STYLES).

Status

Replaced by #292.

Related

• CMD-164
• CMD-165
• documented by https://github.com/TACC/Core-CMS/pull/843
• requires https://github.com/TACC/Core-CMS/pull/840
• requires https://github.com/TACC/Core-CMS/pull/841
• required by https://github.com/TACC/Core-Portal-Deployments/pull/45

Changes

• removed some custom-project_cms
• added some custom-project_assets

Testing & UI

https://github.com/TACC/Core-Portal-Deployments/pull/44

[wesleyboar]

Replaced by #292.