Re-arrange existing reference

doc/reference/en/functions/index.rst

@@ -1,10 +1,11 @@
 Functions
 =========
 
-There are at least* two types of functions - regular functions (they are just called "functions") and aggregate functions. These are completely different concepts. Regular functions work as if they are applied to each row separately (for each row, the result of the function doesn't depend on the other rows). Aggregate functions accumulate a set of values from various rows (i.e. they depend on the entire set of rows).
+There are at least\* two types of functions - regular functions (they are just called "functions") and aggregate functions. These are completely different concepts. Regular functions work as if they are applied to each row separately (for each row, the result of the function doesn't depend on the other rows). Aggregate functions accumulate a set of values from various rows (i.e. they depend on the entire set of rows).
 
 In this section we discuss regular functions. For aggregate functions, see the section "Aggregate functions".
-There is a third type of function that the 'arrayJoin' function belongs to; table functions can also be mentioned separately.
+
+\* - there is a third type of function that the 'arrayJoin' function belongs to; table functions can also be mentioned separately.
 
 
 .. toctree::

doc/reference/en/index.rst

@@ -1,4 +1,3 @@
-
 Documentation
 -------------
 
@@ -9,7 +8,6 @@ Documentation
     getting_started
     interfaces/index
     query_language/index
-    external_data
     table_engines/index
     system_tables/index
     table_functions/index
@@ -19,8 +17,5 @@ Documentation
     functions/index
     agg_functions/index
     dicts/index
-    settings/index
+    operations/index
-    configuration_files
-    access_rights
-    quotas
     roadmap

doc/reference/en/operations/index.rst

@@ -0,0 +1,8 @@
+Operations
+==========
+
+.. toctree::
+    :glob:
+
+    *
+    */index

doc/reference/ru/index.rst

@@ -1,4 +1,3 @@
-
 Документация
 ------------
 
@@ -9,7 +8,6 @@
     getting_started
     interfaces/index
     query_language/index
-    external_data
     table_engines/index
     system_tables/index
     table_functions/index
@@ -19,8 +17,5 @@
     functions/index
     agg_functions/index
     dicts/index
-    settings/index
+    operations/index
-    configuration_files
-    access_rights
-    quotas
     roadmap

doc/reference/ru/operations/index.rst

@@ -0,0 +1,8 @@
+Эксплуатация
+============
+
+.. toctree::
+    :glob:
+
+    *
+    */index