`href="./"` does not work

**Describe the bug**

Deploying an HTML file with a relative link in it leads to 404, and does not display the expected page. However, when serving the site locally it works.

**To Reproduce**
Steps to reproduce the behavior:
1. Deploy `/example/helloworld/index.html` file
2. Deploy `/example/index.html` which contains a `Click` link
3. Navigate to `https://my-static-website-url/example/`
4. Click the link displayed
5. Result is a 404 error, as browser gets redirected to `/helloworld` instead of `/example/helloworld/`

**Expected behavior**
Content of `example/helloworld/index.html` is displayed

**Device info (if applicable):**
- OS: MacOS
- Browser: I tried Chrome, Safari and Firefox
- Version: latest

**Additional context**
When serving the same website locally (e.g. via Nginx, hugo or apache) same code works as expected.