[DOC] Replaced newsletter with Google Groups (#1017)

* Update index.rst

Changed newsletter from TinyLetter to new google groups link.

* Update README.md

Changed newsletter link from TinyLetter to Google Groups

* Update README.md

Changed the content from tinyletter to google groups

* Update support.rst

updated newsletter link to google groups

* Update README.md

Co-authored-by: Eneko Uruñuela <[email protected]>

* Update docs/index.rst

Co-authored-by: Eneko Uruñuela <[email protected]>

* Update README.md

* Update support.rst

* Update README.md

---------

Co-authored-by: Eneko Uruñuela <[email protected]>

README.md

@@ -11,7 +11,7 @@
 [![Average time to resolve an issue](http://isitmaintained.com/badge/resolution/ME-ICA/tedana.svg)](http://isitmaintained.com/project/ME-ICA/tedana "Average time to resolve an issue")
 [![Percentage of issues still open](http://isitmaintained.com/badge/open/ME-ICA/tedana.svg)](http://isitmaintained.com/project/ME-ICA/tedana "Percentage of issues still open")
 [![Join the chat on Mattermost](https://img.shields.io/badge/Chat%20on-Mattermost-purple.svg)](https://mattermost.brainhack.org/brainhack/channels/tedana)
-[![Join our tinyletter mailing list](https://img.shields.io/badge/receive-our%20newsletter%20❤%EF%B8%8F-blueviolet.svg)](https://tinyletter.com/tedana-devs)
+[![Join our Google Group mailing list](https://img.shields.io/badge/receive-our%20newsletter%20❤%EF%B8%8F-blueviolet.svg)](https://groups.google.com/g/tedana-newsletter)
 [![All Contributors](https://img.shields.io/badge/all_contributors-20-orange.svg?style=flat-square)](#contributors)
 [![Code style: black](https://img.shields.io/badge/code%20style-black-000000.svg)](https://github.com/psf/black)
 
@@ -121,8 +121,8 @@ Open or comment on one of [our issues](https://github.com/ME-ICA/tedana/issues)!
 If you're not sure where to begin, feel free to pop into [Mattermost](https://mattermost.brainhack.org/brainhack/channels/tedana) and introduce yourself!
 We will be happy to help you find somewhere to get started.
 
-If you don't want to get lots of notifications, we send out newsletters approximately once per month though our TinyLetter mailing list.
-You can view the [previous newsletters](https://tinyletter.com/tedana-devs/archive) and/or sign up to receive future ones at [https://tinyletter.com/tedana-devs](https://tinyletter.com/tedana-devs).
+If you don't want to get lots of notifications, we send out newsletters approximately once per month though our Google Group mailing list.
+You can view the [previous newsletters](https://groups.google.com/g/tedana-newsletter) and/or sign up to receive future ones by joining at [https://groups.google.com/g/tedana-newsletter](https://groups.google.com/g/tedana-newsletter).
 
 We ask that all contributors to ``tedana`` across all project-related spaces (including but not limited to: GitHub, Mattermost, and project emails), adhere to our [code of conduct](https://github.com/ME-ICA/tedana/blob/main/CODE_OF_CONDUCT.md).
 

docs/index.rst

@@ -49,8 +49,8 @@ tedana: TE Dependent ANAlysis
    :alt: Join the chat
 
 .. image:: https://img.shields.io/badge/receive-our%20newsletter%20❤%EF%B8%8F-blueviolet.svg
-   :target: https://tinyletter.com/tedana-devs
-   :alt: Join our tinyletter mailing list
+   :target: https://groups.google.com/g/tedana-newsletter
+   :alt: Join our Google Group mailing list
 
 .. image:: https://img.shields.io/badge/code%20style-black-000000.svg
    :target: https://github.com/psf/black

docs/support.rst

@@ -31,5 +31,5 @@ Here we attempt to clarify when and how each communication pathway should be use
 - NeuroStars: The NeuroStars forum is to be used by tedana users to ask questions about how to use tedana. tedana's developers may answer usage questions on NeuroStars, but development-related discussions should happen in GitHub Issues and PRs.
 - Mattermost: There is a `tedana channel in the BrainHack Mattermost`_. This is primarily used for online discussions during BrainHack-related hackathons (for example, the annual OHBM hackathon), if and when there is a tedana-related project. We also use this channel to redirect to **existing** Issues and PRs, whether open or closed.
 
-.. _monthly newsletter: https://github.com/ME-ICA/newsletters
+.. _monthly newsletter: https://groups.google.com/g/tedana-newsletter
 .. _tedana channel in the BrainHack Mattermost: https://mattermost.brainhack.org/brainhack/channels/tedana