* Add custom SVGLint rule to lint the general <title> format
i.e. the <title> should be "[ICON_NAME] icon"
* Check if there exists an entry in simple-icons.json with the icon name
... found in the <title>
* Normalize all icons <title> value
* Fix mismatch between HTML's icon title and simple-icons.json title
... due to HTML special entities (such as `&`). Affected icons:
- AT&T (AT&T)
- Let's Encrypt (Let's Encrypt)
* Refactor .svglintrc.js
to make the code style more in line with scripts/prepublish.js
* Add SVG with invalid <title> format
* Add SVG with unknown title
* Revert 6912816 and f002504
