Add options to disable configuration guides on the main page

[Sarisan]

Closes #230

[catfromplan9]

You've mangled the syntax in config.go, please correct that and ensure the git diff only shows your lines being added there. Also, Shouldn't line 47 and line 116 be swapped with 48 and 117? As-is, this leaves two blank lines if client and server configuration guides were disabled which is not what we want. Otherwise, LGTM.

[Sarisan]

You've mangled the syntax in config.go

I added the missing spaces to match with the rest of column, otherwise there will be no space between : and true.

[catfromplan9]

LGTM!

[evan-goode]

I appreciate the motivation and the patch, but I'm hesitant to add more options like this for configuring the web UI. The better approach IMO would be to allow more customization of the home page per #123 (comment).

I could see a WebHomePageTemplate and/or WebHomePageTemplateFile option where the user could specify their own home page layout. The default might be like

{{ template "login" . }}
{{ template "client-configuration" . }}
{{ template "server-configuration" . }}

and the admin could hide/rearrange the sections, or add more, by modifying the template.

In the meantime, we could add these options with the understanding they would likely be deprecated by a better system someday. But on the other hand, I'm leaning towards keeping this patch out of upstream, and if an admin wants to modify the home page, they can patch it themselves Suckless style.

[Sarisan]

It's fine if it will be deprecated in future, just having it now is better than nothing. And I guess it's fine to keep it in pull requests so if anybody really needs it they can cherry pick and build.