We can use the customized header.html file to achieve this. Use the following command to generate the doxygen html templates:
doxygen -w html header.html footer.html customdoxygen.css
Then edit the header.html file. Search for the $projectname variable in the header.html file, and then we can add whatever HTML tags or CSS styles with it. To make it bold, change the original contents as bellow, so it could be bold in the generated html.
<strong>$projectname</strong>
Then set the file in the doxygen.conf file, it will pick up the customized header file.
HTML_HEADER = header.html
Well if you want to make it parts of the text bold, we have to make some tricky things to use the available doxygen.conf variables for different purpose, like:
index.html
Revision <a target="_blank" href="http://hg.openjdk.java.net/" title="$projectname">$projectnumber</a> last modified at <code>$projectbrief</code>
where we make
$projectnumber (PROJECT_NUMBER in doxygen.conf) contains the revision number
$projectbrief (PROJECT_BRIEF in doxygen.conf) contains the last modified date