chore(doc): basic-based tutorials only in HTTP/2

Work done:

• Making all basic deployments use HTTP/2 only
• Removed all non-nrf basic deployments

Related MRs:

• Found an issue in AMF: oai-cn5g-amf!212 (merged)
• Thinh fixed an issue in UDR: oai-cn5g-udr!41 (merged)
• Using PCF MR for HTTP/2: oai-cn5g-pcf!29 (merged)
• Using SMF MR for HTTP/2 fix w/ PCF: oai-cn5g-smf!200 (merged)

docker-compose/docker-compose-basic-nrf.yaml

@@ -203,6 +203,7 @@ services:
             - USE_LOCAL_SUBSCRIPTION_INFO=yes  #Set to yes if SMF uses local subscription information instead of from an UDM
             - REGISTER_NRF=yes
             - DISCOVER_UPF=yes
+            - SMF_SELECTION=yes
             - USE_FQDN_DNS=yes
             # changes for HTTP2
             - HTTP_VERSION=2