Fix article Esp hal beta (#407)

* draft of beta announcement post

* Review comments

* revision 2

* revision 3

* revision 4

* revision 5

* esp-rs logo for feature image

* rework xtensa sentence

* revision 6

* revision 7

* Update docs link

* Fix folder duplicated

* Fix the link check

* Add extra line

* Link issue

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Co-authored-by: Scott Mabin <[email protected]>
Co-authored-by: Scott Mabin <[email protected]>

Author: 3 people