Update signac links.

README.md

@@ -14,7 +14,7 @@ process your entire workflow to completion over many submissions.
 The name is **row** as in *"row, row, row your boat"*.
 
 Notable features:
-* Support arbitrary directories and [signac](https://signac.io) workspaces.
+* Support arbitrary directories and [signac](https://signac.readthedocs.io/) workspaces.
 * Define your workflow in a configuration file.
 * Execute actions via user-defined shell commands.
 * Flexible group definitions:
@@ -71,11 +71,11 @@ dir19     eligible                   691
   Tutorial, command line interface documentation, and configuration file specifications.
 - [Row discussion board](https://github.com/glotzerlab/row/discussions/):
   Ask the **row** user community for help.
-- [signac](https://signac.io):
+- [signac](https://signac.readthedocs.io/):
   Python package to help you manage your workspace.
 
 ## History
 
 **Row** is a spiritual successor to [signac-flow][flow].
 
-[flow]: https://docs.signac.io/projects/flow/en/latest/.
+[flow]: https://signac.readthedocs.io/projects/flow/en/latest/.

doc/src/guide/python/actions.md

@@ -42,7 +42,7 @@ to initialize the signac workspace and populate it with directories.
 > For extra credit, reimplement the **signac** tutorial workflow in **row** after you
 > finish reading this guide.
 
-[*basic* tutorial]: https://docs.signac.io/en/latest/tutorial.html#basics
+[*basic* tutorial]: https://signac.readthedocs.io/en/latest/tutorial.html#basics
 
 ## Write actions.py
 

doc/src/guide/python/signac.md

@@ -1,6 +1,6 @@
 # Working with signac projects
 
-[signac](https://signac.io) is a Python library that helps you manage your workspace
+[signac](https://signac.readthedocs.io/) is a Python library that helps you manage your workspace
 directories. Define **values** as dictionaries, and **signac** will automatically create
 directories for you. **signac** also offers many APIs to iterate, search, and perform
 many other tasks.

doc/src/signac-flow.md

@@ -1,7 +1,7 @@
 # Migrating from signac-flow
 
 **Row** is a spiritual successor to
-[signac-flow](https://docs.signac.io/projects/flow/en/latest/). Many concepts and
+[signac-flow](https://signac.readthedocs.io/projects/flow). Many concepts and
 common usage patters map directly from **signac-flow** to **row**.
 
 Concepts:

doc/src/workflow/workspace.md

@@ -27,4 +27,4 @@ Set
 ```toml
 workspace.value_file = "signac_statepoint.json"
 ```
-to use **row** with [signac](https://signac.io) workspaces.
+to use **row** with [signac](https://signac.readthedocs.io/) workspaces.