When creating a KDevelop project, the subdirectory docs/en already contains the english index.sgml documentation file and the already produced output HTML files. Those are already included into the project as well as their installation destination is preset to the KDE HTML directory. The documentation is already adapted to your project name, version number and the programmer's information. Further, the output covers the index.html file containing the table of contents (which is opened by KDE Help when the user requests help); an installation introduction and a copyright information with regards to the GPL license.
Therefore, when extending the documentation, you only have to add the information that is specifically to your project. Mind that for KDE projects you have to run "Make Doc-Handbook" from the "Project" menu again after the project is created. The index.sgml file is again processed by ksgml2html and the KDE-Style is added to the HTML output. Open the docs/en directory in the RFV and add the logotp3.gif file to the project by the context-menu; then set the file properties correctly to install the logo file into the same location the HTML files will go - to $(kde&_;htmldir)/en/&<;your&_;project&>;/logotp3.gif.