feat: establish redux feature-based folder structure and rootReduce

[jahrulezfrancis]

Summary

This PR establishes a consistent, scalable Redux folder structure following a feature-based organization. It migrates the state management architecture from a monolithic approach to a domain-specific one by distributing slice logic into dedicated directories under src/features/.

Proposed Changes

Feature Directories

Created the following directories under src/features/, each containing boilerplate for Slice.js, Thunks.js, and Selectors.js:

• auth/
• campaigns/
• donations/
• dashboard/
• admin/
• bookmarks/

Store Configuration

• Root Reducer: Created src/store/rootReducer.js using combineReducers to integrate all new feature reducers.
• Store Entry: Updated src/store/index.js to import and use the new rootReducer, replacing the previous placeholder logic.

Documentation

• Added src/store/README.md to define the new folder convention and provide clear instructions for team members on how to add future features.

Impact

• Maintainability: Logic is now scoped to specific domains, making it easier to locate and modify code.
• Scalability: New features can be added by following the established pattern without cluttering the main store file.
• Clarity: The added documentation ensures consistent implementation across the team.

Verification

• All 6 feature directories and 18 placeholder files created.
• rootReducer.js correctly imports and combines all feature slices.
• Store configuration updated and verified for correct imports.

Closes #3

[ayshadogo]

Hello @jahrulezfrancis please fix Lint workflow

[jahrulezfrancis]

@ayshadogo lint error is fixed, kindly check it out