282 on opportunities page data pipeline + companies + people is fetched from be (#285)

* feature: get pipelines columns from backend

* feature: display item not found instead of crashing

* feature: add BoardCard component

* feature: display items from the backend

* refactor: extract useBoard in a hook

* refactor: export only loading and error from useBoard

* refactor: create var pipelineStage

* feature: implement support for Company boards

front/src/modules/opportunities/components/BoardCard.tsx

@@ -0,0 +1,5 @@
+import styled from '@emotion/styled';
+
+export const BoardCard = styled.p`
+  color: ${(props) => props.theme.text80};
+`;