updated needed readme changes (#360)

### 📜 Description

- Describe the general shape of this PR (new feature? refactor? bug fix?
one-line change?)
<!--- Add your answer here -->

- Describe what changes are being made
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- Describe why these changes are being made
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- List the use cases and edge cases relevant to this PR
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- Describe how errors will be handled. How will we know if this code
breaks in production
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- Describe any external libraries/dependencies added or removed in this
PR
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- Describe any security risks are there regarding this change
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- Describe how you tested these changes
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- Link to relevant external documentation
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<!--- Example: API docs, architecture diagrams, MDN docs -->


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### 📋 Mandatory Checklist

- [x] Example of a checked item (please remove when creating your Pull
Request)

- [ ] Linked to the Github Issues being addressed using the right
sidebar ➡️
- [ ] Have you discussed these changes with the project leader(s)?
- [ ] Do all variable and function names communicate what they do?
- [ ] Were all the changes commented and / or documented?
- [ ] Is the PR the right size? (If the PR is too large to review, it
might be good to break it up into multiple PRs.)
- [ ] Does all work in progress, temporary, or debugger code have a TODO
comment with links to Github issues?
- [ ] *If you changed the user interface, did you add before and after
screenshots to below?*

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### 🖼️ Screenshots and Screen Recordings

#### Before
<!--- Add before screenshots here -->


#### After
<!--- Add after screenshots here -->


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### 📘 Glossary
- PR = Pull Request

README.md

@@ -23,7 +23,7 @@ The City of San Jose is interested in this service, but this is a project that c
 
 # Resources
 
-- Slack Channel: [#proj-happening-atm-eng](https://codeforsanjose.slack.com/archives/C017G1BP02H)
+- Discord Channel: [#proj-happening-atm-eng](https://discord.gg/Pr9QATNxXD)
 - [Google Drive](https://drive.google.com/drive/folders/1a89AKh3Kia3BGYeMUF7ishE4avblFIYu?usp=sharing)
 - [Links to Visual Design Mocks](https://docs.google.com/document/d/1Jcdsw6d8MMXWaU_PTPcMVtoTtBxtx4A7d0VfhMH7K5M/edit)
 - [Latest Kanban ToDo list](https://trello.com/b/pfECjOgE/happening-atm) TODO: Update to JIRA board?
@@ -50,7 +50,7 @@ TODO via Github Actions
 
 
 ## Live deployments
-  - `stage`: https://happening-atm-stage.codeforsanjose.org
+  - `stage`: https://happeningatm-stage.opensourcesanjose.org
   - `prod`: Production is not live yet
 
 ## Contributing