Use version number placeholders in content

[fhemberger]

After just pushing #219, can we please add placeholders in the content files for:

• io.js version number
• V8 version number used in io.js
• V8 version number used in Node.js (see ES6 page)
• Node.js (stable) version number (see ES6 page)

Those should be replaced during the build process, so we don't need to touch every single translation, updating every single download link for each platform with a new release.

[AntouanK]

Happy to work on that, if the WG members agree.

[Fishrock123]

Yeah, plan was to do this from the start, except it would read an external json when available, and default to a local one for testing.

[AntouanK]

Exactly, a JSON should be enough to hold the versions and their string/URL representations.
Should be easy reading it in gulp and injecting it into the md files.

[therebelrobot]

+1 to this. Feel free to PR @AntouanK

[AntouanK]

@therebelrobot I have an open PR for that

[parroit]

👍 really useful

[snostorm]

See #251 for some movement on this

[snostorm]

Things like URLs should also be generating dynamically. Really the whole index.md file should probably be retired with something .json powered. Although #251 has a little bit of this now, consider it an ongoing evolution. (#251 was a quick improvement, not necessarily the final solution.)

[Fishrock123]

#251 fixed the version number issue.

We didn't do node version numbers yet, but we can just do that when a release comes out from there, or if someone wants to spend a few minutes doing it.