Remove the suggestion that BuildGrid can be used as an artifact server
Description
BuildGrid no longer supports being used as an artifact cache for BuildStream master. This MR reflects that situation in the docs, which currently suggest that it is still possible to use the index
and both
cache types with a BuildGrid server.
Changes proposed in this merge request:
- Update
format_project.rst
to only recommend BuildGrid as artifact storage, rather than as an index-only or fully-featured artifact cache.