docs: update PSLab app links

[macayu17]

Fixes #283

Changes

• Replace the README GUI link from the retired pslab-desktop repo with fossasia/pslab-app.
• Update the installation docs to use the same PSLab app link.

Testing

• python -m build
• tox -e docs
• tox -e lint
• git diff --check

I also ran tox -e integration. It fails locally on the current upstream test setup, unrelated to this documentation change:

• Python 3.13: collection fails in tests/test_spi.py and tests/test_uart.py because _frequency / _baudrate resolve as methods.
• Python 3.11: tests collect, then fail because pytest-mock is missing and tests/conftest.py calls SerialHandler() without the required port.

Summary by Sourcery

Update documentation to point to the current PSLab GUI application repository.

Documentation:

• Replace README GUI link from the retired pslab-desktop repository with the current fossasia/pslab-app link.
• Align installation documentation to reference the updated PSLab app repository link.

[sourcery-ai]

Reviewer's guide (collapsed on small PRs)

Reviewer's Guide

This PR updates documentation to point from the deprecated pslab-desktop GUI repository to the current PSLab app repository, keeping README and installation docs consistent.

Flow diagram for updated GUI documentation link

flowchart LR
    User["User reads PSLab documentation"] --> DecideGUI["Needs GUI for PSLab"]
    DecideGUI --> InstallPython["Install pslab-python (CLI/acquisition)"]
    DecideGUI --> VisitAppRepo["Open PSLab app repo (fossasia/pslab-app)"]
    VisitAppRepo --> FollowReadme["Follow repo Readme to install GUI app"]

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File-Level Changes

Change	Details	Files
Update GUI application links in documentation from the deprecated pslab-desktop repo to the current PSLab app repo.	Replace the README note’s GUI link target with the fossasia/pslab-app repository and adjust visible link text accordingly. Align the installation documentation to use the same updated PSLab app repository link for GUI usage instructions.	README.md docs/installation.rst

Assessment against linked issues

Issue	Objective	Addressed	Explanation
#283	Update README.md to replace the outdated pslab-desktop application link with the current PSLab app repository link.	✅

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[sourcery-ai]

Hey - I've found 1 issue

Prompt for AI Agents

Please address the comments from this code review:

## Individual Comments

### Comment 1
<location path="README.md" line_range="32" />
<code_context>
 **Note**: Windows users who use the PSLab v6 device must download and install the CP210x Windows Drivers from the [Silicon Labs website](https://www.silabs.com/developers/usb-to-uart-bridge-vcp-drivers?tab=downloads) in order for pslab-python to be able to communicate with the PSLab device.

-**Note**: If you are only interested in using PSLab as an acquisition device without a display/GUI, only pslab-python needs to be installed. If you would like a GUI, install the [pslab-desktop app](https://github.com/fossasia/pslab-desktop) and follow the instructions of the Readme in that repo.
+**Note**: If you are only interested in using PSLab as an acquisition device without a display/GUI, only pslab-python needs to be installed. If you would like a GUI, install the [PSLab app](https://github.com/fossasia/pslab-app) and follow the instructions of the Readme in that repo.


</code_context>
<issue_to_address>
**suggestion (typo):** Consider changing "Readme" to "README" to match the conventional filename.

This will align the reference with the actual filename in the repo and improve clarity for readers.

```suggestion
**Note**: If you are only interested in using PSLab as an acquisition device without a display/GUI, only pslab-python needs to be installed. If you would like a GUI, install the [PSLab app](https://github.com/fossasia/pslab-app) and follow the instructions of the README in that repo.
```
</issue_to_address>

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[Copilot]

Pull request overview

Note

Copilot was unable to run its full agentic suite in this review.

Updates user-facing documentation to point to the current PSLab GUI application and aligns link formatting across RST/Markdown docs.

Changes:

• Replace the deprecated pslab-desktop link with pslab-app in installation docs.
• Update README’s GUI note to reference pslab-app.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 1 comment.

File	Description
docs/installation.rst	Switches GUI reference to pslab-app using proper reStructuredText link syntax.
README.md	Updates GUI note to link to the pslab-app GitHub repository.

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[Copilot]

Pull request overview

Copilot reviewed 2 out of 2 changed files in this pull request and generated 2 comments.