fix(v2): make optional title for footer links column #3666
Merged
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Motivation
Since the footer link item can only consist of raw HTML code, it makes sense to remove the required title for a footer column.
For example, the Gulp.js website uses that feature to add a logo, but they can't update to the latest Docusaurus because the footer title is required to specify (more precisely, this is one reason why it is impossible to upgrade, see the comment for more details).
Have you read the Contributing Guidelines on pull requests?
Yes
Test Plan
Remove title from footer link item, and make sure that the site start without validation errors.
Related PRs
(If this PR adds or changes functionality, please take some time to update the docs at https://github.com/facebook/docusaurus, and link to your PR here.)