Update README.md with current project instructions

README.md

 # quickref
 
-The `quickref` ASDF system currently provides helper functions used to bridge
-the gap between `declt` and `quicklisp`.
+Quickref generates a website with reference manuals for every
+[Quicklisp](https://www.quicklisp.org) library available.
 
-To launch the generation of documentation for every quicklisp package, use the
-[`qlmapper`](https://github.com/xach/qlmapper) package with `test_declt.lisp`:
+The reference manuals are generated by
+[Declt](https://github.com/didierverna/declt).
+
+## Using `quickref`:
+
+From the lisp REPL, just do:
 
 ```lisp
-(qlmapper:map-releases "repo-path/test_declt.lisp")
+(ql:quickload "quickref")
+(quickref:refresh)
+```
+
+This will trigger a complete cycle, which includes downloading and installing
+the Quicklisp packages, generating the .texi files for all of them thanks to,
+and generating the final website structure by converting the .texi files to
+HTML.
+
+The generated files can by default be found in `$HOME/quickref/`.
+
+## Docker image:
+
+A Docker image is available, it ships with a complete build environment that
+aims to reproduce the one used to create the Quicklisp releases.
+
+To run quickref from the image just do:
+
 ```
+docker pull quickref/quickref
+docker run quickref/quickref
+```
+
+This will run `(quickref:refresh)` in the image.
 
-To list packages where the installation or generation of documentation failed,
-execute the `list_untreated.sh` script in quicklisp's package directory
-(usually `~/quicklisp/dists/quicklisp/software`)
-This will create a `missing_texi.txt` file with directories missing the texi
-documentation.
+You can then get the produced files with
 
+```
+docker cp my-container:/home/quickbuilder/quickref .
+```
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