Add font and window geometry settings to "Quick Start" example config (#6412)

* Add initial rows/cols to config quick start
* Add 'docs' target to Makefile

Makefile

@@ -1,4 +1,4 @@
-.PHONY: all fmt build check test
+.PHONY: all fmt build check test docs servedocs
 
 all: build
 
@@ -22,3 +22,8 @@ build:
 fmt:
 	cargo +nightly fmt
 
+docs:
+	ci/build-docs.sh
+
+servedocs:
+	ci/build-docs.sh serve

docs/config/files.md

@@ -11,15 +11,28 @@ local wezterm = require 'wezterm'
 -- This will hold the configuration.
 local config = wezterm.config_builder()
 
--- This is where you actually apply your config choices
+-- This is where you actually apply your config choices.
 
--- For example, changing the color scheme:
+-- For example, changing the initial geometry for new windows:
+config.initial_cols = 120
+config.initial_rows = 28
+
+-- or, changing the font size and color scheme.
+config.font_size = 10
 config.color_scheme = 'AdventureTime'
 
--- and finally, return the configuration to wezterm
+-- Finally, return the configuration to wezterm:
 return config
 ```
 
+For more details, see:
+
+- [wezterm.config_builder](lua/wezterm/config_builder.md)
+- [initial_cols](lua/config/initial_cols.md)
+- [initial_rows](lua/config/initial_rows.md)
+- [font_size](lua/config/font_size.md)
+- [color_scheme](lua/config/color_schemes.md)
+
 ## Configuration Files
 
 `wezterm` will look for a [lua](https://www.lua.org/manual/5.3/manual.html)