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>

charts/fission-all/Chart.yaml

@@ -1,21 +1,25 @@
 apiVersion: v2
 name: fission-all
 version: v1.15.0-rc1
+appVersion: v1.15.0-rc1
 description: Fission is a fast serverless framework for Kubernetes.
-keywords:
-- fission
-- serverless
 home: https://fission.io/
+icon: https://fission.io/images/logo-gh.svg
+sources:
+  - https://github.com/fission/fission
+  - https://github.com/fission/keda-connectors
+keywords:
+  - fission
+  - serverless
 maintainers:
   - name: Vishal Biyani
     email: vishal@infracloud.io
   - name: Sanket Sudake
     email: sanket@infracloud.io
 engine: gotpl
-appVersion: v1.15.0-rc1
 type: application
 dependencies:
   - name: prometheus
     version: 13.2.1
     repository: https://prometheus-community.github.io/helm-charts
-    condition: prometheus.enabled
+    condition: prometheus.enabled