README change (more stuff for microbit) part 2

[vandyliu]

AB#34117

Description:

• use absolute links instead of relative links
• changed all usage of double quotes to single quotes for elements (eg. src="" to src='')
• changed some alt names for images to be more specific

Limitations:

Please describe limitations of this PR

Testing:

Please describe the tests that you ran to verify your changes. Provide instructions so we can reproduce. Please also list any relevant details for your test configuration

• Test A
• Test B

Checklist:

• My code follows the style guidelines of this project
• My code has been formatted with npm run format and passes the checks in npm run check
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• Any dependent changes have been merged and published in downstream modules

[nasadigital]

Good catch!

[andreamah]

thanks! 😁