Enhance README and configuration files for Bangladesh Core FHIR Implementation Guide

- Updated README.md to provide a comprehensive overview and purpose of the guide.
- Added BDLocation profile for immunization locations.
- Modified BDMedicationRequest profile to include additional references.
- Updated immunization profile with improved references and definitions.
- Removed obsolete location profile.
- Commented out sections in sushi-config.yaml for clarity.

ig.ini

@@ -1,7 +1,6 @@
 [IG]
 # ini file for the Implementation Guide publisher
 # see comments below for instructions
-
 ig = input/myig.xml
 #template = fhir.base.template#current
 template = #bd-national-template
@@ -42,7 +41,4 @@ examples:
 
 
 #   other parameters are defined in the ImplementationGuide resource:
-#   https://confluence.hl7.org/display/FHIR/Implementation+Guide+Parameters
-
-#   for more documentation on implementation guides and templates, see the FHIR Guidance ImplementationGuide 
-#   http://build.fhir.org/ig/FHIR/ig-guidance
+#   https://confluence.hl7.org/display/FHIR/Implementation+Guide+Parameters