docs: add TOC to general pages

user_guide_src/source/general/ajax.rst

@@ -8,6 +8,10 @@ To get around this problem, the most efficient solution (so far) is to manually
 
 Here's how to force the ``X-Requested-With`` header to be sent in the Fetch API and other JavaScript libraries.
 
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+    :local:
+    :depth: 2
+
 Fetch API
 =========
 

user_guide_src/source/general/caching.rst

@@ -12,6 +12,10 @@ page load speeds. By caching your pages, since they are saved in their
 fully rendered state, you can achieve performance much closer to that of
 static web pages.
 
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+    :local:
+    :depth: 2
+
 How Does Caching Work?
 ======================
 

user_guide_src/source/general/environments.rst

@@ -9,6 +9,10 @@ while developing an application, but it may also pose a security issue
 when "live". In development environments, you might want additional
 tools loaded that you don't in production environments, etc.
 
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+    :local:
+    :depth: 2
+
 The ENVIRONMENT Constant
 ========================
 

user_guide_src/source/general/managing_apps.rst

@@ -8,6 +8,10 @@ directory. It is possible, however, to have multiple sets of
 applications that share a single CodeIgniter installation, or even to
 rename or relocate your application directory.
 
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+    :local:
+    :depth: 2
+
 Renaming or Relocating the Application Directory
 ================================================
 

user_guide_src/source/general/urls.rst

@@ -2,6 +2,10 @@
 CodeIgniter URLs
 ################
 
+.. contents::
+    :local:
+    :depth: 2
+
 By default, URLs in CodeIgniter are designed to be search-engine and human-friendly. Rather than using the standard
 "query-string" approach to URLs that is synonymous with dynamic systems, CodeIgniter uses a **segment-based** approach::