refactoring: Breakdown fission-all chart into components and removed fission-core (#2224)

* Sync a few files from fission-all to fission-core chart
* Change values in fission-all chart
We keep the following components by default disabled now, which were enabled by default earlier.

1. nats - Fission Nats integration
2. influxdb - Influxdb and logger component
3. prometheus - Prometheus disabled by default
4. canaryDeployment - Disabled by default

This change reduces the need for a fission-core chart and we can configure
values of fission-all so that it can provide the behaviour of fission-all
as well as fission-core.

* Remove fission-core chart
* Add README in the fission-all chart
* Rename clusterrolebinding fission-crd to fission-cr-admin
* Add icon and sources in helm chart

Signed-off-by: Sanket Sudake <sanketsudake@gmail.com>

.github/workflows/push_pr.yaml

@@ -72,7 +72,7 @@ jobs:
 
       - name: Helm chart lint
         run: |
-          helm lint charts/fission-all/ charts/fission-core/
+          helm lint charts/fission-all/
 
       - name: Helm update
         run: helm repo add prometheus-community https://prometheus-community.github.io/helm-charts