BUG: Election.sol: in `removeCandidate()`, removing a candidate does not maintain the order of candidates.

### Is there an existing issue for this?

- [x] I have searched the existing issues

### Issue Description ✍️

## 📌 Describe the Bug
If a candidate is removed, the function replaces the last candidate with the candidate to be removed and then pops the last candidate, hence the order of candidate is changed

i.e
```
candidates[_id] = candidates[candidates.length - 1];
candidate.pop();
```

## 🚨 Actual Behavior
For instance: if candidatesId array is [0,1,2,3,4,5], deleting the candidate 1 will result in the array: [0,5,2,3,4], which results in candidate name order changed.

## 🎯 Expected Behavior
considering above example, the resulted array should be [0,2,3,4,5] and the last candidate shouldn't be right after first candidate.

## 📷 Screenshot
### Before deletion:


### After Deleting candidate with ID #1


## 💡 Suggestions
Threre are two fixes:

1. shift the elements to right places before popping (uses for loop and is very gas inefficient for large arrays):
```
function removeCandidate(uint _id) external onlyOwner electionStarted {
if (_id >= candidates.length) revert InvalidCandidateID();

// Shift all elements after the removed candidate one position to the left
for (uint i = _id; i < candidates.length - 1; i++) {
candidates[i] = candidates[i + 1];
}

// Remove the last element
candidates.pop();
}
```

2. Mark the candidate inactive instead of actually removing them:

```
struct Candidate {
uint candidateID;
string name;
string description;
bool isActive; // New field to track active status
}
```

and in function:

```
function removeCandidate(uint _id) external onlyOwner electionStarted {
if (_id >= candidates.length) revert InvalidCandidateID();

// Mark the candidate as inactive
candidates[_id].isActive = false;
}
```

and then in frontend code, just check the active status and display the names in order.

### Record

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