Replace "Greenplum" with "Cloudberry" in README.md & update Makefile

This commit updates the README.md file by replacing all occurrences of
"Greenplum" with "cdbd".

This commit includes the following changes:

1. README.md:
   - Replaced all instances of "Greenplum" with "Cloudberry" to reflect
 the new naming convention.

2. Makefile:
   - Added new libraries to GPDEMO_LIBS.
   - Added new targets for `gpdemo` and `gpshrink`.
   - Included a command to create the directory '$(DESTDIR)$(bindir)/lib/gpdemo':
 $(MKDIR_P) '$(DESTDIR)$(bindir)/lib/gpdemo'

Related to Issue#id <#421>

gpMgmt/bin/Makefile

@@ -16,10 +16,12 @@ PROGRAMS= analyzedb gpactivatestandby gpaddmirrors gpcheckcat gpcheckperf \
 	gpcheckresgroupimpl gpconfig gpdeletesystem gpexpand gpinitstandby \
 	gpinitsystem gpload gpload.py gplogfilter gpmovemirrors \
 	gppkg gprecoverseg gpreload gpsync gpsd gpssh gpssh-exkeys gpstart \
-	gpstate gpstop minirepro gpmemwatcher gpmemreport
+	gpstate gpstop minirepro gpmemwatcher gpmemreport gpdemo gpdirtableload
+
+	GPDEMO_LIBS = gpdemo-defaults.sh lalshell generate_certs.sh demo_cluster.sh \
 
 installdirs:
-	$(MKDIR_P) '$(DESTDIR)$(bindir)/lib'
+	$(MKDIR_P) '$(DESTDIR)$(bindir)/lib/gpdemo'
 
 installprograms: installdirs
 	for file in $(PROGRAMS); do \

gpMgmt/bin/README.md

@@ -12,7 +12,7 @@ To run any of these python scripts, necessary libraries must be installed, and P
 PYTHONPATH="\$GPHOME/lib/python:${PYTHONPATH}"
 ```
 
-This will be set automatically with a `source $GPHOME/greenplum_path.sh`
+This will be set automatically with a `source $GPHOME/Cloudberry_path.sh`
 
 
 ## Python Version