RFR: 8258420: Move URL configuration from Docs.gmk to conf dir

Tue Dec 15 17:56:11 UTC 2020

In `Docs.gmk` there are some hard-coded links to online URL documentation and bug reporting locations. These should not reside in the make file per se, but instead move to the `make/conf` directory.

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Commit messages:
 - 8258420: Move URL configuration from Docs.gmk to conf dir

Changes: https://git.openjdk.java.net/jdk/pull/1785/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=1785&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8258420
  Stats: 39 lines in 2 files changed: 33 ins; 6 del; 0 mod
  Patch: https://git.openjdk.java.net/jdk/pull/1785.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/1785/head:pull/1785

PR: https://git.openjdk.java.net/jdk/pull/1785