✨ feat(title): add invert_title_order config option

[welpo]

Summary

This PR introduces a new configuration option invert_title_order that allows users to customize the order of the "site title" and "page title" in browser tabs.

Linked issue

Resolves #135.

Changes made

• Added invert_title_order boolean setting to config.toml and theme.toml.
• Modified set_title.html macro to incorporate the new invert_title_order setting.
• Updated config.toml and theme.toml documentation to explain the new feature.

Reasoning

With longer site titles, the page title can sometimes be obscured when viewed in the browser tab. The new invert_title_order setting provides users with more flexibility by allowing the page title to be displayed before the site title. This improves the user experience by making the current page content more prominent when browsing between tabs.

Example

The default title is formed like:

~/tabi • Secure by default

If the setting is true, the title would become:

Secure by default • ~/tabi