[Docs] Update URLs for multidoc page

Author: mtfishman

Project.toml

@@ -1,7 +1,7 @@
 name = "ITensors"
 uuid = "9136182c-28ba-11e9-034c-db9fb085ebd5"
 authors = ["Matthew Fishman <[email protected]>", "Miles Stoudenmire <[email protected]>"]
-version = "0.8.3"
+version = "0.8.4"
 
 [deps]
 Adapt = "79e6a3ab-5dfb-504d-930d-738a2a938a0e"

docs/src/getting_started/NextSteps.md

@@ -4,7 +4,7 @@
 
 * Read the [ITensor Paper](https://www.scipost.org/SciPostPhysCodeb.4) for a long-form introduction to the design and main features of the ITensor library
 
-* Refer to the [ITensorMPS.jl documentation](https://itensor.github.io/ITensorMPS.jl) for information on running finite MPS/MPO calculations such as DMRG.
+* Refer to the [ITensorMPS.jl documentation](https://docs.itensor.org/ITensorMPS) for information on running finite MPS/MPO calculations such as DMRG.
 
 * More Julia language tutorials and resources
     - [From zero to Julia!](https://techytok.com/from-zero-to-julia/)

docs/src/index.md

@@ -5,7 +5,7 @@ tensor network algorithms.
 
 | **Documentation**|**Citation**|
 |:----------------:|:----------:|
-|[![Stable](https://img.shields.io/badge/docs-stable-blue.svg)](https://itensor.github.io/ITensors.jl/stable/) [![Dev](https://img.shields.io/badge/docs-dev-blue.svg)](https://itensor.github.io/ITensors.jl/dev/)|[![SciPost](https://img.shields.io/badge/SciPost-10.21468-blue.svg)](https://scipost.org/SciPostPhysCodeb.4) [![arXiv](https://img.shields.io/badge/arXiv-2007.14822-b31b1b.svg)](https://arxiv.org/abs/2007.14822)|
+|[![Stable](https://img.shields.io/badge/docs-stable-blue.svg)](https://docs.itensor.org/ITensors/stable/) [![Dev](https://img.shields.io/badge/docs-dev-blue.svg)](https://docs.itensor.org/ITensors/dev/)|[![SciPost](https://img.shields.io/badge/SciPost-10.21468-blue.svg)](https://scipost.org/SciPostPhysCodeb.4) [![arXiv](https://img.shields.io/badge/arXiv-2007.14822-b31b1b.svg)](https://arxiv.org/abs/2007.14822)|
 
 |**Version**|**Download Statistics**|**Style Guide**|**License**|
 |:---------:|:---------------------:|:-------------:|:---------:|
@@ -24,13 +24,13 @@ The [ITensorMPS.jl library](https://github.com/ITensor/ITensorMPS.jl)
 includes composable and extensible algorithms for optimizing and transforming
 tensor networks, such as matrix product state and matrix product operators, such as
 the DMRG algorithm. If you are looking for information on running finite MPS/MPO
-calculations such as DMRG, take a look at the [ITensorMPS.jl documentation](https://itensor.github.io/ITensorMPS.jl).
+calculations such as DMRG, take a look at the [ITensorMPS.jl documentation](https://docs.itensor.org/ITensorMPS).
 
 Development of ITensor is supported by the Flatiron Institute, a division of the Simons Foundation.
 
 ## News
 
-- March 22, 2025: As part of the latest release of ITensors.jl (v0.8.3), all documentation related to MPS/MPO functionality has been moved to the [ITensorMPS.jl documentation](https://itensor.github.io/ITensorMPS.jl).
+- March 22, 2025: As part of the latest release of ITensors.jl (v0.8.3), all documentation related to MPS/MPO functionality has been moved to the [ITensorMPS.jl documentation](https://docs.itensor.org/ITensorMPS).
 
 - February 22, 2025: Please note that there were issues installing the latest version of ITensors.jl (ITensors.jl v0.8) in older versions of Julia v1.10 and v1.11 ([https://github.com/ITensor/ITensors.jl/issues/1618](https://github.com/ITensor/ITensors.jl/issues/1618), [https://itensor.discourse.group/t/typeparameteraccessors-not-found-error-on-julia-v-1-10-0/2260](https://itensor.discourse.group/t/typeparameteraccessors-not-found-error-on-julia-v-1-10-0/2260)). This issue has been fixed in [NDTensors.jl v0.4.4](https://github.com/ITensor/ITensors.jl/pull/1623), so please try updating your packages if you are using older versions of Julia v1.10 or v1.11 and running into issues installing ITensors.jl.
 
@@ -49,7 +49,7 @@ Development of ITensor is supported by the Flatiron Institute, a division of the
 - March 25, 2022: ITensors.jl v0.3 has been released. The main breaking change is that we no longer support versions of Julia below 1.6. Julia 1.6 is the long term support version of Julia (LTS), which means that going forward versions below Julia 1.6 won't be as well supported with bug fixes and improvements. Additionally, Julia 1.6 introduced many improvements including syntax improvements that we would like to start using with ITensors.jl, which becomes challenging if we try to support Julia versions below 1.6. See [here](https://www.oxinabox.net/2021/02/13/Julia-1.6-what-has-changed-since-1.0.html) and [here](https://julialang.org/blog/2021/03/julia-1.6-highlights/) for some nice summaries of the Julia 1.6 release.
 
 -  Jun 09, 2021: ITensors.jl v0.2 has been released, with a few breaking changes as well as a variety of bug fixes
-and new features. Take a look at the [upgrade guide](https://itensor.github.io/ITensors.jl/stable/UpgradeGuide_0.1_to_0.2.html)
+and new features. Take a look at the [upgrade guide](https://docs.itensor.org/ITensors/stable/UpgradeGuide_0.1_to_0.2.html)
 for help upgrading your code.
 
 ## Installation
@@ -78,7 +78,7 @@ We recommend using ITensors.jl with Intel MKL in order to get the best possible
 
 ## Documentation
 
-- [**LATEST**](https://itensor.github.io/ITensors.jl/dev/) -- *documentation of the latest version.*
+- [**LATEST**](https://docs.itensor.org/ITensors/dev/) -- *documentation of the latest version.*
 
 ## Citation