Add new images and general cleanup

[davehorsfall]

Description

• Add Login Again link to logged out page
• Add "Register" button to navigation (previously just login button)
• Remove duplicated button in hero template
• Add new image on homepage

• Open intro video in modal

• Update images on about page

Type of change

• Documentation (non-breaking change that adds or improves the documentation)
• New feature (non-breaking change which adds functionality)
• Optimization (non-breaking, back-end change that speeds up the code)
• Technical work (non-breaking, change which is work as part of a new feature)
• Bug fix (non-breaking change which fixes an issue)
• Breaking change (whatever its nature)

Key checklist

• All tests pass (eg. python -m pytest)
• The documentation builds and looks OK (eg. mkdocs serve)
• Pre-commit hooks run successfully (eg. pre-commit run --all-files)

Further checks

• Code is commented, particularly in hard-to-understand areas
• Tests added or an issue has been opened to tackle that in the future. (Indicate issue here: # (issue))

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.

📢 Thoughts on this report? Let us know!

[tdjames1]

This all looks great. Nice photos!

One more suggestion for the home page is that you could link to the "about" page from the final section ("A competencies framework for Digital Research Technical Professionals")

[davehorsfall]

Thansk @tdjames1. I've create a new Issue for your suggestion #497