Add nix-shell tools, fix circleci, resolves #322

README.md

@@ -2,20 +2,17 @@
 
 PostgREST docs use the reStructuredText format, check this [cheatsheet](https://github.com/ralsina/rst-cheatsheet/blob/master/rst-cheatsheet.rst) to get acquainted with it.
 
-You can use [pipenv](https://pipenv.readthedocs.io) to build the docs locally:
-
-```bash
-  pipenv install
-  pipenv run python livereload_docs.py
-```
-
-Or if you use [nix](https://nixos.org/nix/), you can just run:
+To build the docs locally, use [nix](https://nixos.org/nix/):
 
 ```bash
   nix-shell
 ```
 
-Both of these options will build the docs and start a livereload server on `http://localhost:5500`.
+Once in the nix-shell you have the following commands available:
+
+- `postgrest-docs-build`: Build the docs.
+- `postgrest-docs-serve`: Build the docs and start a livereload server on `http://localhost:5500`.
+- `postgrest-docs-spellcheck`: Run aspell.
 
 ## Documentation structure