Update docs for newer firmware (Polprzewodnikowy#143)

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## Description
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Update the "supported" SC64 firmware version.

## Motivation and Context
<!--- What does this sample do? What problem does it solve? -->
<!--- If it fixes/closes/resolves an open issue, please link to the
issue here -->
Although the latest firmware is not "required", it is best to keep it
aligned.

## How Has This Been Tested?
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## Screenshots
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## Types of changes
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the boxes that apply: -->
- [ ] Improvement (non-breaking change that adds a new feature)
- [ ] Bug fix (fixes an issue)
- [ ] Breaking change (breaking change)
- [ ] Documentation Improvement
- [ ] Config and build (change in the configuration and build system,
has no impact on code or features)

## Checklist:
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that apply. -->
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- [ ] My code follows the code style of this project.
- [ ] My change requires a change to the documentation.
- [ ] I have updated the documentation accordingly.
- [ ] I have added tests to cover my changes.
- [ ] All new and existing tests passed.

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<!-- This is an auto-generated comment: release notes by coderabbit.ai
-->
## Summary by CodeRabbit

- **New Features**
- Updated the supported firmware version for "SummerCart64" to 2.20.0+
in error messages.
- **Documentation**
- Revised developer documentation to reflect the upgrade of the SC64
deployer to v2.20.0, including updated links and compatibility
requirements.
- Clarified instructions for using the dev container and added a
workaround for USB device communication.
	- Expanded guidance on generating and serving documentation locally.
<!-- end of auto-generated comment: release notes by coderabbit.ai -->

.devcontainer/Dockerfile

@@ -1,6 +1,6 @@
 FROM debian:bookworm-slim
 
-ARG SC64_DEPLOYER_VERSION=v2.18.0
+ARG SC64_DEPLOYER_VERSION=v2.20.0
 RUN apt-get update && \
     apt-get upgrade -y && \
     apt-get install build-essential doxygen git python3 wget -y && \

docs/99_developer_guide.md

@@ -8,11 +8,11 @@ You can use a dev container in VSCode to ease development.
 
 ### To deploy:
 #### SC64
-* Download the deployer [here](https://github.com/Polprzewodnikowy/SummerCart64/releases/download/v2.18.0/sc64-deployer-windows-v2.18.0.zip)
+* Download the deployer [here](https://github.com/Polprzewodnikowy/SummerCart64/releases/download/v2.20.0/sc64-deployer-windows-v2.20.0.zip)
 * Extract and place `sc64deployer.exe` in the `tools/sc64` directory.
 
-Make sure that your firmware is compatible (currently v2.18.0+)
-See: [here](https://github.com/Polprzewodnikowy/SummerCart64/blob/v2.18.0/docs/00_quick_startup_guide.md#firmware-backupupdate)
+Make sure that your firmware is compatible (currently v2.20.0+)
+See: [here](https://github.com/Polprzewodnikowy/SummerCart64/blob/v2.20.0/docs/00_quick_startup_guide.md#firmware-backupupdate)
 
 ##### From the devcontainer
 It is not currently possible to directly communicate with USB devices.

src/menu/views/fault.c

@@ -7,7 +7,7 @@ static void draw (menu_t *menu, surface_t *d) {
     rdpq_clear(RGBA32(0x7F, 0x00, 0x00, 0xFF));
 
     const char *firmware_message = (
-        "Supported firmware versions:\n"
+        "Minimum supported firmware versions:\n"
         "64drive: 2.05+\n"
         "EverDrive-64: ???+\n"
         "SummerCart64: 2.17.0+"