Skip to content is available on the new Ravelry site only. I have heard from the Ravelry team who pointed this out. I’m sure I am not alone in not realising this and have suggested that they make it very clear that any updates are for the new site only.
If you go to the new site and then press your tab key till the Ravelry logo has border round it. You can then press the tab key the contents of the border will change to ‘skip to content’. The two versions can be seen below.