RFR: 7057: Update Copyright year in About dialog and update site landing page

Mon Dec 14 18:42:56 UTC 2020

On Mon, 14 Dec 2020 18:30:31 GMT, Guru Hb <ghb at openjdk.org> wrote:

> 1. Updated Copyright year in About Dialog box to 2020.
> 2. Update site landing (html) page updated  for : 
>     RCP index.html : Banner text (at the top) required padding (similar to IDE update site) 
>     Updated Copyright year to 2020.
>     Removed JDK 9 entry (as this version is not supported any more) 
>     Offline Download entry removed (as They are not hosted). 
>     Eclipse 4.8 or later to Eclipse IDE 4.16 or later.

Marked as reviewed by hirt (Lead).

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PR: https://git.openjdk.java.net/jmc/pull/182