* Set default theme to light in `ThemeContext`
* Update README and environment configuration files for clarity and completeness and to reflect current project status
* Update dark theme colour scheme
Added `featuredCategories` section,
Added personalised variations of HomePage contents;
- Removal of redundant/unused files from backend;
- Update to README: Updated to current method for deploying;
- Known bug: StreamsContext is being called before AuthContext, leading to unpersonalised streams & categories each time, even when logged in;
