chore: disable removeTitle from default plugins

[SethFalco]

Remove Title

This has been on the to-do list for a while, but was considered a breaking change.

The removeTitle plugin is problematic because it removes core accessibility features. Consider the following example:

— https://svgo.dev/

The Docusuaurs logo and PostCSS logo are actually linked to the respective projects websites. A screen reader can read what these links are out loud, for example, when the user focuses on them by pressing tab.

However, before disabling removeTitle, the screen reader would only read "Link", that's it. Not what the link was, but only "Link". This is not a positive user experience.

After disabling the removeTitle plugin, the screen reader now reads "Docusaurus, Link" and "PostCSS, Link" respectively.

SVGO should not discriminate against users with impairments by default. Accessibility is more important that optimization.

Other projects like Docusaurus and SVGR already disable this by default, so it's actually a more common setup already amongst our installs.

Chores

• Makes few other amendments so the docs reflect that removeViewBox and removeTitle are disabled.
• Deletes the outdated changelog which is no longer needed in this repository.