Add Freehold Cottage residential care reference; remove jobs page

[stefan-burke]

Summary

• Adds a reference to Freehold Cottage on the Home and Eligibility pages, describing it as the place where residential care is provided to tenants whose quality of life is improved in a group setting and who may benefit from 24-hour support in a homely residential setting.
• Deletes the Job Vacancies page (_pages/jobs.md), which also removes it from the top navigation.

Note: there's no existing "Services" tab, so per discussion the reference was added to the Home and Eligibility pages rather than introducing a new tab.

Test plan

• Build the Jekyll site and confirm Home and Eligibility pages render the new Freehold Cottage paragraph with a working link to https://www.freeholdcottage.com
• Confirm the "Job Vacancies" link no longer appears in the top navigation
• Confirm /jobs/ returns the not-found page

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