This page contains only content that has the tag project.
This works thanks to this code:
<FeedItems filterByTags={['project']} />
More about the FeedItems component in the docs: gatsby-theme-chronoblog#feeditems-component
This is convenient for creating pages with your works, portfolio, collecting articles of a certain subject in one place, etc.
If you do not need an extra page, just remove it from src/pages/, and remove link to this page from the main menu: src/gatsby-theme-chronoblog/site-header.mdx.
More about the additional site pages in the docs: gatsby-theme-chronoblog#pages