The status badge was using an outdated URL format that no longer
resolves correctly.

- Updated badge URL from `/workflows/{workflow-name}/` to
`/actions/workflows/{filename}/` format
- Added link wrapper to make badge clickable (navigates to workflow
page)

```markdown
[![Build Status](https://github.com/mvdbos/php-spider/actions/workflows/php.yml/badge.svg?branch=master)](https://github.com/mvdbos/php-spider/actions/workflows/php.yml)
```

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<details>

<summary>Original prompt</summary>

> 
> ----
> 
> *This section details on the original issue you should resolve*
> 
> <issue_title>Fix the status badge on the README</issue_title>
> <issue_description>Fix the status badge on the README, and base it on
latest master run of Github Actions for this repo</issue_description>
> 
> ## Comments on the Issue (you are @copilot in this section)
> 
> <comments>
> </comments>
> 


</details>

- Fixes mvdbos/php-spider#116

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