Use `example.com` as placeholder, fixes #70

[Fenrirthviti]

Fixes #70.

Supersedes #71 as the correct fix rather than placeholder. Keeps original authorship from #71 as well.

Closes #71

Description

Adds a variable to cmake for specifying the website, and changes the default to example.com which is safer than mywebsite.com.

Motivation and Context

Don't like bad websites.

How Has This Been Tested?

Tested locally, works

Types of changes

• Tweak (non-breaking change to improve existing functionality)

Checklist:

• [X] My code has been run through clang-format.
• [X] I have read the contributing document.
• [X] My code is not on the master branch.
• [X] The code has been tested.
• [X] All commit messages are properly formatted and commits squashed where appropriate.
• [X] I have included updates to all appropriate documentation.

[gxalpha]

Commit title could probably be adjusted to something like cmake: Use example.com as placeholder website to remove the "fixes" part. Unsure what our stance on the fixes tag in the commit body is. And technically the commit body is too long but I doubt anyone ever checks the plugintemplate commit history in such detail :P

[RytoEX]

Commit title could probably be adjusted to something like cmake: Use example.com as placeholder website to remove the "fixes" part.

We don't have well enforced rules on this repository for it, but we can edit this, yes.

Unsure what our stance on the fixes tag in the commit body is.

We don't have a stance. It's fine either in the PR description, or the commit message body, or both. The downside of mentioning in the commit message body is that every time the commit is updated and force-pushed, the linked Issue will get a new unique notification.

[Fenrirthviti]

Updated commit title/description.