Relative URLs in Sharepoint Pages

I want to create a small manual in Sharepoint Pages with one main index page (Manual.aspx) pointing to 20 other pages. The index page is placed in ~sites/[Teams name]/SitePages/Manual.aspx/ and the 20 subpages are placed in a subfolder ~sites/[Teams name]/SitePages/Manual_subpages/Subpage01.aspx

Is it a way to use relative links the index/manual file so that the 21 files later on could be moved to another site?

It seams that the Insert link box only accepts URLs starting with https:// indicating that only absolute adresses are accepted.