Windows build fails due to unsupported strftime("%-d") format in homepage template

## Description

While building the OSSIE website on Windows, the build fails with the following exception:

```text
ValueError: Invalid format string
```

The error originates from the homepage template:

```jinja
{{ post.date.strftime('%B %-d, %Y') }}
```

The `%-d` format specifier is supported on Unix-like platforms but is not supported by Python's `strftime()` implementation on Windows.

As a result, `mkdocs serve` and `mkdocs build` fail on Windows.

## Steps to Reproduce

1. Clone the repository on Windows.
2. Install the project dependencies.
3. Run:

```bash
mkdocs serve
```

or

```bash
mkdocs build
```

## Actual Result

The build fails with:

```text
ValueError: Invalid format string
```

## Expected Result

The website should build successfully on Windows, Linux, and macOS.

## Possible Solution

Use a cross-platform date formatting approach instead of `%-d`.

One possible implementation is:

```python
post.date.strftime("%B %d, %Y").replace(" 0", " ")
```

This preserves the existing output format (for example, `July 3, 2026`) while remaining compatible across Windows, Linux, and macOS.

Alternatively, another platform-independent formatting approach could be used if preferred.

Locate the homepage template containing the post.date.strftime('%B %-d, %Y') expression and review how MkDocs renders it. Replace the platform-specific date formatting with a cross-platform approach, then run mkdocs build or mkdocs serve; done means the site builds successfully and dates retain the existing format on Windows, Linux, and macOS.

Written by the indexing model from the issue text.