feat(docs): add architecture/roadmap (#9624)

* feat(docs): Add architecture overview

* add strucutre for rough roadmap

* add stable reference

* document stable links

* test mermaid again

* fix loading

* fix format to reduce warnings

* use local js

* add architecture ovierview

* add more sub-points

* more structure

* add general backend text

* add sme bqsic docs for frontend

* fix list syntax

* fix typo

docs/docs/plugins/mixins/export.md

@@ -24,7 +24,7 @@ Each plugin can dictate which datasets are supported using the `supports_export`
       summary: False
       members: []
       extra:
-        show_sources: True
+        show_source: True
 
 The default implementation returns `True` for all data types.
 
@@ -40,7 +40,7 @@ The `generate_filename` method constructs a filename for the exported file.
       summary: False
       members: []
       extra:
-        show_sources: True
+        show_source: True
 
 ### Adjust Columns
 
@@ -54,7 +54,7 @@ The `update_headers` method allows the plugin to adjust the columns selected to
       summary: False
       members: []
       extra:
-        show_sources: True
+        show_source: True
 
 ### Queryset Filtering
 
@@ -68,7 +68,7 @@ The `filter_queryset` method allows the plugin to provide custom filtering to th
       summary: False
       members: []
       extra:
-        show_sources: True
+        show_source: True
 
 ### Export Data
 
@@ -82,7 +82,7 @@ The `export_data` method performs the step of transforming a [Django QuerySet]({
       summary: False
       members: []
       extra:
-        show_sources: True
+        show_source: True
 
 Note that the default implementation simply uses the builtin tabulation functionality of the provided serializer class. In most cases, this will be sufficient.