Document turning off suggestions/history

Also add more mentions of `fish_config` in general.

doc_src/interactive.rst

@@ -29,6 +29,9 @@ To accept the autosuggestion (replacing the command line contents), press :kbd:`
 
 Autosuggestions are a powerful way to quickly summon frequently entered commands, by typing the first few characters. They are also an efficient technique for navigating through directory hierarchies.
 
+If you don't like autosuggestions, you can disable them by setting ``$fish_autosuggestion_enabled`` to 0::
+
+  set -g fish_autosuggestion_enabled 0
 
 .. _tab-completion:
 
@@ -81,6 +84,16 @@ Detected errors include:
 
 To customize the syntax highlighting, you can set the environment variables listed in the :ref:`Variables for changing highlighting colors <variables-color>` section.
 
+Fish also provides pre-made color themes you can pick with :ref:`fish_config <cmd-fish_config>`. Running just ``fish_config`` opens a browser interface, or you can use ``fish_config theme`` in the terminal.
+
+For example, to disable nearly all coloring::
+
+  fish_config theme choose none
+
+Or, to see all themes, right in your terminal::
+
+  fish_config theme show
+
 .. _variables-color:
 
 Syntax highlighting variables

doc_src/language.rst

@@ -1268,6 +1268,8 @@ You can change the settings of fish by changing the values of certain variables.
 
 - ``fish_emoji_width`` controls whether fish assumes emoji render as 2 cells or 1 cell wide. This is necessary because the correct value changed from 1 to 2 in Unicode 9, and some terminals may not be aware. Set this if you see graphical glitching related to emoji (or other "special" characters). It should usually be auto-detected.
 
+- ``fish_autosuggestion_enabled`` controls if :ref:`autosuggestions` are enabled. Set it to 0 to disable, anything else to enable. By default they are on.
+
 - ``fish_handle_reflow``, determines whether fish should try to repaint the commandline when the terminal resizes. In terminals that reflow text this should be disabled. Set it to 1 to enable, anything else to disable.
 
 - ``fish_key_bindings``, the name of the function that sets up the keyboard shortcuts for the :ref:`command-line editor <editor>`.

doc_src/tutorial.rst

@@ -112,6 +112,15 @@ This tells you that there exists a file that starts with ``somefi``, which is us
 
 These colors, and many more, can be changed by running ``fish_config``, or by modifying :ref:`color variables <variables-color>` directly.
 
+For example, if you want to disable (almost) all coloring::
+
+  fish_config theme choose none
+
+This picks the "none" theme. To see all themes::
+
+  fish_config theme show
+
+Just running ``fish_config`` will open up a browser interface that allows you to pick from the available themes.
 
 Wildcards
 ---------
@@ -195,6 +204,10 @@ And history too. Type a command once, and you can re-summon it by just typing a
 
 To accept the autosuggestion, hit :kbd:`→` (right arrow) or :kbd:`Control`\ +\ :kbd:`F`. To accept a single word of the autosuggestion, :kbd:`Alt`\ +\ :kbd:`→` (right arrow). If the autosuggestion is not what you want, just ignore it.
 
+If you don't like autosuggestions, you can disable them by setting ``$fish_autosuggestion_enabled`` to 0::
+
+  set -g fish_autosuggestion_enabled 0
+
 Tab Completions
 ---------------