Cleanup Eclipse and Equinox download area

[HannesWell]

The Eclipse and Equinox download areas currently contain many files that are not relevant anymore for current builds and releases:

• https://download.eclipse.org/justj/?file=eclipse
• https://download.eclipse.org/justj/?file=eclipse/downloads

Actually relevant nowadays are only

• https://download.eclipse.org/justj/?file=eclipse/updates
• https://download.eclipse.org/justj/?file=eclipse/relengScripts
• https://download.eclipse.org/justj/?file=eclipse/downloads/drops4/
• https://download.eclipse.org/justj/?file=eclipse/downloads/index.html
• https://download.eclipse.org/justj/?file=eclipse/downloads/data.json
• https://download.eclipse.org/justj/?file=eclipse/downloads/images/ (only some, i.e. those with recent date)

Similarly for Equinox:

• https://download.eclipse.org/justj/?file=equinox/

While the new (w.o. php) web-pages are intentionally fully self-contained, I cannot tell if this is also true for older release websites, especially the ones ten or even 20 years old. Maybe they reference any of these old style- or php-files, images etc.

Therefore my proposal is to move everything that's not relevant anymore to the eclipse archive:
https://archive.eclipse.org/eclipse/

Then the files still could be restored if necessary and would be available for reference in case somebody is still interested in them. Plus, there are redirects in place from the download area to the archive for all files available in the latter (which I find awesome).
For example
https://download.eclipse.org/eclipse/downloads/drops/R-2.1.3-200403101828/readme_eclipse_2_1_3.html
redirects to
https://archive.eclipse.org/eclipse/downloads/drops/R-2.1.3-200403101828/readme_eclipse_2_1_3.html

I would only delete files that look obviously irrelevant for any build drop sites, like

• https://download.eclipse.org/eclipse/TIME (a timestamp from 2015)
• https://download.eclipse.org/justj/?file=eclipse/ztime

If anybody has objections, please speak up, otherwise I'll archive all relevant files and folders by the middle of the upcoming week.

[HannesWell]

Furthermore we are currently keeping the update-sites of all old releases in the eclipse download area:

• https://download.eclipse.org/justj/?file=eclipse/updates

Similar to the release build/drop websites, we could (and IMO should) move update sites of older releases to the archive too.
But I assume the p2-repos are probably in active use for longer. Therefore my proposal is to keep the p2-repos of more releases in the download area than we do for release builds, i.e. I propose to keep at least the last ten.

[merks]

FYI the download.eclipse.org server “transparently” redirects to archive.eclipse.org so moving something won’t break the links to it including p2 which will follow the redirects.