Closes #2883: Imagify Plugin - Replace the documentation link with the upgrade one for Free users

[jeawhanlee]

Description

Fixes https://github.com/wp-media/imagify/issues/2883
Users on starter plan will see link to upgrade from the plugin page.

Type of change

• Enhancement (non-breaking change which improves an existing functionality).

Detailed scenario

N/A

Technical description

Documentation

Replaces the documentation link with the upgrade link in the plugin action links if the plan_id = 1

New dependencies

N/A

Risks

N/A

Mandatory Checklist

Code validation

• I validated all the Acceptance Criteria. If possible, provide screenshots or videos.
• I triggered all changed lines of code at least once without new errors/warnings/notices.
• I implemented built-in tests to cover the new/changed code.

Code style

• I wrote a self-explanatory code about what it does.
• I did not introduce unnecessary complexity.

[Mai-Saad]

@marija-nikolic Here are screenshots after the change (looks good to me)

• starter plan
  

• growth plan
  

• infinite plan
  

Notes:

• upgrade link is working
• translations aren't handled here

[marija-nikolic]

@marija-nikolic Here are screenshots after the change (looks good to me)

• starter plan
  
• growth plan
  
• infinite plan
  

Notes:

• upgrade link is working
• translations aren't handled here

Thanks. Can we please update the color to #6f9c3b (to improve visibility)?

[remyperona]

Updated screenshot

[marija-nikolic]

Updated screenshot

Thank you, it seems more visible now.