What makes a web page inaccessible?
Missing or inaccurate alt text
If the image truly is decorative and has no real meaning for the user, you should put it in the CSS rather than the HTML. If that's not possible, use null alt text, or <alt="">, which will cause a screen reader to skip over the image entirely when converting a web page into audio.
Can you make a website only accessible by link?
Sometimes you want a page that can be accessed by a link but not something that displays in your main menu or footer. This can be done by setting the page to hidden.