Dynamic guide layout and hero

[peterhudec]

What

Implements the responsive layout and the hero section for the EYB dynamic guide page to be later filled with other markup. Note that:

• I have used CSS grid for the layout as the GDS grid is not fit for this purpose: it's not designed for gaps between rows and columns and it is impossible to position and scale the region-map to fit into the available space as it's still based on float with clearfix.
• I added a new constant for the ubiquitous value of 1025px hardcoded in many media queries to styles/sizes/sizes.scss but I couldn't figure out the meaning of that size so I temporarily named it $donknowhowtonameit-size hoping that reviewers of this PR will come with some meeningfull name suggestions
• I added new SVG files, one for each the UK regions. We can however most likely only use a single SVG and highlight concrete regions with CSS, but that's out of the scope of this PR.
• The sections in left and right panels below the top panel have zero padding as they will need to accomodate content with bleeding horizontal lines

How to test

1. Navigate to /international/expand-your-business-in-the-uk/guide/?dynamic
2. The layout and the top panel should look as designed here

Screenshot

IGUK-840-841.mov

Workflow

• Ticket exists in IGUK-840(Jira https://uktrade.atlassian.net/browse/IGUK-840) and [IGUK-841](Jira https://uktrade.atlassian.net/browse/IGUK-841)
• Jira ticket has the correct status.
• A clear/description pull request messaged added.

Reviewing help

• Explains how to test locally, including how to set up appropriate data
• Includes screenshot(s) - ideally before and after, but at least after
• Documentation has been updated as necessary
• Where a PR contains code changes developed or maintained by multiple squads a representative from those squads should review the PR.

Housekeeping

• Added all new environment variables to Vault.
• Cleaned up old feature flags
• Upgraded any vulnerable dependencies.
• I have updated security dependencies
• Python requirements have been re-compiled.
• I have checked that my PR is using the latest package versions of: great-components, directory-constants, directory-healthcheck, directory-validators, directory-components, directory-api-client, directory-ch-client, django-staff-sso-client, directory-forms-api-client, directory-sso-api-client, sigauth

Security

• Frontend assets have been re-compiled
• Checked for potential security vulnerabilities
• Ensured any sensitive data is handled appropriately

Performance

• Evaluated the performance impact of the changes
• Ensured that changes do not negatively affect application scalability.

Merging

• This PR can be merged by reviewers. (If unticked, please leave for the author to merge)