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.

sushi-config.yaml

@@ -1,19 +1,19 @@
-id: bd.fhir.core
-canonical: https://fhir.dghs.gov.bd/core
-name: BangladeshCoreFHIRIG
-title: Bangladesh Core FHIR Implementation Guide
-description: >
-  This Implementation Guide defines the Bangladesh Core FHIR profiles,
-  value sets, code systems, and implementation rules for national digital health systems.
-status: draft
-version: 0.2.0
-fhirVersion: 4.0.1
-copyrightYear: 2025+
-releaseLabel: CI Build
+# id: bd.fhir.core
+# canonical: https://fhir.dghs.gov.bd/core
+# name: BangladeshCoreFHIRIG
+# title: Bangladesh Core FHIR Implementation Guide
+# description: >
+#   This Implementation Guide defines the Bangladesh Core FHIR profiles,
+#   value sets, code systems, and implementation rules for national digital health systems.
+# status: draft
+# version: 0.2.0
+# fhirVersion: 4.0.1
+# copyrightYear: 2025+
+# releaseLabel: CI Build
 FSHOnly: true
-publisher:
-  name: Directorate General of Health Services (DGHS), Bangladesh
-  url: https://dghs.gov.bd
-parameters:
-  logo: assets/images/001.svg
-  show-in-header: true
+# publisher:
+#   name: Directorate General of Health Services (DGHS), Bangladesh
+#   url: https://dghs.gov.bd
+# parameters:
+#   logo: assets/images/001.svg
+#   show-in-header: true