refactoring: Fix documentation generation, (auto)remove documentation of deleted themes

Docs/BuiltinQuestions.md

@@ -34,7 +34,6 @@ The following items can be easily reused in your layers
     + [payment-options-advanced](#payment-options-advanced)
     + [denominations-coins](#denominations-coins)
     + [denominations-notes](#denominations-notes)
-    + [last_edit](#last_edit)
     + [all_tags](#all_tags)
     + [multilevels](#multilevels)
     + [level](#level)
@@ -53,6 +52,8 @@ The following items can be easily reused in your layers
 
 
 
+{questions()}
+
 *Read-only tagrendering*
 
 
@@ -379,16 +380,6 @@ what notes can you use to pay here?
 
 
 
-### last_edit 
-
-
-
-<div class='subtle' style='font-size: small; margin-top: 2em; margin-bottom: 0.5em;'><a href='https://www.openStreetMap.org/changeset/{_last_edit:changeset}' target='_blank'>Last edited on {_last_edit:timestamp}</a> by <a href='https://www.openStreetMap.org/user/{_last_edit:contributor}' target='_blank'>{_last_edit:contributor}</a></div>
-
-*Read-only tagrendering*
-
-
-
 ### all_tags