Contentful CMS integration

[ChrisFong604]

Describe your changes

This PR integrates the Contentful CMS into the code. The official contentful Javascript client was used. Code for the join page and [jobId] dynamic route page was re-organized.

Testing steps

• checkout to CMS
• run pnpm install
• update your local environment file with the the CONTENTFUL_SPACE_ID and CONTENTFUL_ACCESS_TOKEN environment variables, which can be found in the notion documentation in the technology department
• launch the local server, and check to ensure that all of the job listings appear in the /join route, and that clicking on an individual post leads to a dynamic route with the full job description
• Login to contentful (credentials in notion), create a new Job Listing entry, and then check to see that the entry appears on your local server.

Once testing is complete and the correct behaviour is verified, please remove any dummy data created in contentful.

Issue ticket number and link

#66

Checklist before requesting a review

• I have performed a self-review of my code
• If it is a core feature, I have added thorough tests.
• Do we need to implement analytics?

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[ChrisFong604]

Deploy preview failed due to lack of environment variables. After updating them, the deployment preview worked: https://app.netlify.com/sites/sfusurgedev/deploys/6715d601dc3fa0d10e000c7e