remove .agola/config.yml

since we use the jsonnet format

.agola/config.yml

@@ -1,60 +0,0 @@
-runs:
-  - name: agola build/test
-    tasks:
-      - name: build go1.12
-        runtime:
-          type: pod
-          arch: amd64
-          containers:
-            - image: golang:1.12-stretch
-              environment:
-                ENV01: envvalue01
-        working_dir: /go/src/github.com/sorintlab/agola
-        environment:
-          GO111MODULE: "on"
-          VAR01:
-            from_variable: var01
-        steps:
-          - run: env
-          - clone:
-          - run: SKIP_DOCKER_TESTS=1 go test -v -count 1 ./...
-      - name: build docker tests go1.12
-        runtime:
-          type: pod
-          arch: amd64
-          containers:
-            - image: golang:1.12-stretch
-              environment:
-                ENV01: envvalue01
-        working_dir: /go/src/github.com/sorintlab/agola
-        environment:
-          GO111MODULE: "on"
-        steps:
-          - run: env
-          - clone:
-          - run:
-              name: build docker tests binary
-              command: CGO_ENABLED=0 go test -c ./internal/services/runservice/executor/driver -o ./bin/docker-tests
-              environment:
-                ENV01: envvalue01
-          - save_to_workspace:
-              contents:
-                - source_dir: ./bin
-                  dest_dir: /bin/
-                  paths:
-                    - "*"
-      - name: test docker driver
-        runtime:
-          type: pod
-          arch: amd64
-          containers:
-            - image: docker:stable-dind
-              privileged: true
-              entrypoint: dockerd
-        steps:
-          - run: env
-          - restore_workspace:
-              dest_dir: .
-          - run: ./bin/docker-tests -test.parallel 1 -test.v
-        depends:
-          - build docker tests go1.12