docs: update readme

Author: gadomski

README.md

@@ -2,7 +2,7 @@
 
 [![CI](https://github.com/developmentseed/labs-375-stac-geoparquet-backend/actions/workflows/ci.yml/badge.svg)](https://github.com/developmentseed/labs-375-stac-geoparquet-backend/actions/workflows/ci.yml)
 
-We're going to build a service that searches a [stac-geoparquet](https://github.com/stac-utils/stac-geoparquet) file with a [STAC API item search query](https://api.stacspec.org/v1.0.0/item-search/), and compare its performance to the same service backed by [pgstac](https://github.com/stac-utils/pgstac) and [ElasticSearch](https://www.elastic.co/elasticsearch).
+We're building a service to search [stac-geoparquet](https://github.com/stac-utils/stac-geoparquet) with a STAC API [query](https://api.stacspec.org/v1.0.0/item-search/).
 
 ## Core assumptions
 
@@ -45,6 +45,7 @@ graph TD
 ```
 
 [Milestones](https://github.com/developmentseed/labs-375-stac-geoparquet-backend/milestones) are checkpoints and are used to group phases.
+Bugs and one-off tasks can live outside of the hierarchy.
 
 ## Resources