Move codebase page into reference chapter

docs/api/joins.md

@@ -49,9 +49,10 @@ $result = civicrm_api3('Event', 'get', array(
 
 ## Identifying fields eligible for a join
 
-It is possible to join an entity to any other entity if the [xml](/core/architecture.md#xml)
-schema identifies a [foreign key](https://en.wikipedia.org/wiki/Foreign_key) or
-a pseudoconstant.  The [getfields](/api/actions.md#getfields) action identifies
+It is possible to join an entity to any other entity if the
+[xml schema](/framework/database/schema-definition.md)
+identifies a [foreign key](/framework/database/schema-definition.md#table-foreignKey) or
+a [pseudoconstant](/framework/database/schema-definition.md#table-field-pseudoconstant).  The [getfields](/api/actions.md#getfields) action identifies
 fields that are eligible for an API join.
 
 !!! warning

docs/extensions/civix.md

@@ -193,7 +193,7 @@ to create a new entity. For this, you can use the command `civix generate:entity
 
 1. Edit the [XML schema definitions](/framework/database/schema-definition.md) in the `xml` folder to define your desired fields.
 
-1. Generate a [DAO file](/core/architecture.md#dao) and SQL to create your table. *(For now, civix does not handle this part. Hopefully these steps will become easier at some point in the future.)*
+1. Generate a [DAO file](/framework/codebase.md#dao) and SQL to create your table. *(For now, civix does not handle this part. Hopefully these steps will become easier at some point in the future.)*
 
     1. Begin with a *development* installation of CiviCRM core.
 

mkdocs.yml

@@ -27,7 +27,6 @@ pages:
   - How to Contribute: core/contributing.md
   - Reviewing PR's: core/pr-review.md
   - Release Process: core/release-process.md
-  - Codebase & Architecture: core/architecture.md
 - Extensions:
   - Basics: extensions/index.md
   - Packaging Options: extensions/packaging.md
@@ -208,6 +207,7 @@ pages:
   - Cache Reference: framework/cache.md
   - CiviMail: framework/civimail.md
   - CiviReport: framework/civireport.md
+  - Codebase: framework/codebase.md
   - Database:
     - Overview: framework/database/index.md
     - XML Schema definition: framework/database/schema-definition.md

redirects/internal.txt

@@ -9,3 +9,4 @@ framework/schema-definition framework/database/schema-definition
 api/params api/options
 core/develop tools/git
 basics/filesystem framework/filesystem
+core/architecture framework/codebase