Tracking: Static Site generation support in wp-now

[adamziel]

This is a single issue to keep track of all the wp-now limitations listed in https://github.com/adamziel/playground-docs-workflow/pull/48. Let's turn those into separate issues.

• [ ] #239
• [ ] https://github.com/WordPress/playground-tools/issues/26
• [ ] https://github.com/WordPress/playground-tools/issues/245
• [ ] https://github.com/WordPress/playground-tools/issues/73
• [ ] #244
• [ ] https://github.com/WordPress/playground-tools/issues/240
• [ ] https://github.com/WordPress/playground-tools/issues/220
• [ ] #243
• [ ] #241
• [ ] #242