Support direct `JobView`

[nexushoratio]

Found by clicking on the header of a job entry. Link is like https://www.linkedin.com/jobs/view/3710541136

Possible page read selectors:

• div.jobs-company__content
• div.jobs-similar-jobs

====

• [x] #224
• [x] Primary navigation
• [x] #225
• [x] Secondary navigation
• [x] Show more
• [x] Apply to job (or previous application)
• [x] Toggle saving job
• [x] Toggle following company