ENH: Espresso: improved documentation

The current documentation is completely out of date, here we talk about parallel_info, profile, ph.x, etc...

The alternative calculator section have been removed since the two listed were last updated 8 years ago

Checklist

• I am familiar with ASE's contribution guidelines.
• Doc strings in code changed in this MR are up to date.
• Unit tests have been added for new or changed code.
• Issue is resolved via "closes #XXXX" if applicable.