- Corrected some typos and added new slice variable in amf

* All official images produced by CI are pushed to `oaisoftwarealliance` Docker-Hub Team account
* New tutorial:
  - My5gRAN Tester --> `docs/DEPLOY_SA5G_WITH_My5g-RANTester.md`
* Updated helm charts and helm chart tutorial for K8s and Openshift
* Reduced image size for all network functions
* New wiki page to know more about variable which can be configured for each network function
* Fix HTTP/2 support for all network functions `docker-compose/docker-compose-basic-nrf-httpv2.yaml`

- VPP-UPF tutorial without nrf is not working for UL
- VPP-UPF with HTTPV2 is not working for UL

- Fixing the tutorials for release v1.4.0

(fix) Commit changed smf info

See merge request oai/cn5g/oai-cn5g-fed!56

- The variable USE_LOCAL_SUBSCRIPTION_INFO should be yes

Slicing tutorial fix

See merge request oai/cn5g/oai-cn5g-fed!55

- Updated helm chart tutorial
- Added Openshift build config with readme for ran, core, ue

- Added openshift build config files with readme
- Updated helm-chart tutorial

My5grantester tutorial

See merge request !47

Update docs/DEPLOY_SA5G_WITH_My5g-RANTester.md, docker-compose/docker-compose-my5grantester-vpp.yaml

Merge branch 'master' of https://gitlab.eurecom.fr/oai/cn5g/oai-cn5g-fed into my5grantester_tutorial

Completely new helm chart for all the network functions

See merge request !52