Bug 557 simplified membership structure

[Freshrojek]

Description

membership doesn't consist of "sand" and "space", it is now restructured to just one membership - with an option of how much you want to donate

Related Issue

resolves #557

Types of changes

• [x] Bug fix (non-breaking change which fixes an issue)
• [ ] New feature (non-breaking change which adds functionality)
• [ ] Breaking change (fix or feature that would cause existing functionality to change)

Checklist:

• [x] My code follows the code style of this project.
• [ ] My change requires a change to the documentation.
• [ ] I have updated the documentation accordingly.
• [x] I have read the CONTRIBUTING document.
• [x] I have added tests to cover my changes.
• [x] All new and existing tests passed.

[jamesgeddes]

[sonarcloud[bot]]

Kudos, SonarCloud Quality Gate passed!   

0 Bugs
0 Vulnerabilities
0 Security Hotspots
0 Code Smells

No Coverage information
0.0% Duplication

[jamesgeddes]

@Freshrojek Happy for you to merge when ready 👍

[Freshrojek]

Awesome thanks, I'm in Torquay right now so will do later!