Tighten up the README file.

README.md

 # Quickref
-
 Quickref is a global documentation project for Common Lisp libraries. It
 generates a website containing reference manuals for every
 [Quicklisp](https://www.quicklisp.org) library available. The reference
@@ -13,12 +12,10 @@ needed to generate your own version of the website.
 
 
 ## Using Quickref
-
 In order to generate your local version of the website, you can use Quickref
 either through the provided Docker images, or directly from the source.
 
 ### From Docker
-
 This is the simplest way to use Quickref. The Docker image ships with a
 complete build environment that aims to reproduce the one used to create the
 Quicklisp releases. This means it contains (almost) all the dependencies
@@ -56,7 +53,6 @@ errors during processing (from both Declt and `makeinfo`).
 
 
 ### From the source
-
 If you're feeling bold, you can also run Quickref directly from the source,
 but beware that Quicklisp has a *lot* of external dependencies that will be
 required for processing. Look at the file `docker/debian-8-packages.txt` to
@@ -77,10 +73,8 @@ HTML.
 The generated files (logs, Texinfo, and HTML) can be found in `~/quickref/`.
 
 #### Customization
-
 The `REFRESH` function accepts a number of keyword options allowing you to
 tweak the behavior of Quickref.
-
   * `:parallel`: if true, Quickref will parallelize the generation of the
   Texinfo and HTML files. This option is recommended if your machine has
   multiple cores available.
@@ -93,7 +87,6 @@ tweak the behavior of Quickref.
 
 
 ## Docker images
-
 You can build your own Quickref Docker images by using the provided
 Dockerfiles located in the `docker` directory. The project is split in 2
 separate images:
@@ -110,7 +103,6 @@ the hundreds of dependencies installed from `apt`).
 
 
 ### Building the images
-
 The two Quickref Docker images are created by typing respectively (and in that
 order):
 ```
@@ -119,7 +111,6 @@ docker build -t quickref .
 ```
 
 ### Extracting the website
-
 With `docker ps -a`, get the name/ID of your image. The output should look
 like this (with a different name/ID for you):
 ```