Change command for flashing firmware

[marcnause]

Flashing via pslab flash does not work currently, but using mcbootflash as a fallback works.

Summary by Sourcery

Documentation:

• Update the README to reflect the change in the command for flashing firmware from pslab flash to mcbootflash.

[sourcery-ai[bot]]

Reviewer's Guide by Sourcery

This pull request updates the firmware flashing instructions in the README.md file, replacing the use of 'pslab flash' command with 'mcbootflash' command. It also adds information about the mcbootflash tool and its installation.

User journey diagram for firmware flashing process

journey
    title Firmware Flashing Process
    section Preparation
      User: Press 'BOOT' button
      User: Release 'BOOT' button
    section Flashing
      User: Run `mcbootflash --port <portname> -b 460800 firmware.hex`
    section Completion
      User: Reset or power cycle the device

File-Level Changes

Change	Details	Files
Update firmware flashing instructions	Replace 'pslab flash' command with 'mcbootflash' command Add information about mcbootflash tool and its installation Update baud rate in the flashing command to 460800	README.md

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[bessman]

Thank you!