I think Kompozer is a spin-off/standalone version of the old Mozilla integrated HTML editor. I used to use that many years ago, but haven't really seen/used it (or other WYSIWYG editors) in a while now, so I can't speak directly to it's usefulness. Looking at what it offers though, it's probably a good place to start, and as it's free, there's not really a downside to trying it out for a while. One thing to note is that most modern sites on the web don't usually use static HTML anymore, and tend to run CMS systems or the like. That is to say, things like wordpress, joomla, etc. I know quite a few users here specifically use wordpress with the comicpress plugin.
http://comicpress.org/ Using something like that basically lets you have all the nifty features like archives/calendars, rants/blog posts, forward/back and other navigation, etc. pretty much out of the box. The tradeoff is that it can be somewhat difficult to customize if you don't like the normal layout options (though basic customization like colors, your own art for headers and buttons and such is pretty easy.) That said though, it works pretty well for most comics, and is MUCH faster to get setup and running than learning HTML and doing things the hard/manual way. There are other comic-specific systems out there too (comikaze, comiccms, walrus, comicgallery, etc.), though I'm not really sure how they rate compared to comic press as I've never used them much directly.
