Rename config.md to metrics.md

config.md only contained information on metrics, makes more sense for it
to be name metrics.md

Change-Id: Ie35774e52aa97351c0b7c351c6084b428fe52b7d

README.md

diff --git a/README.md b/README.md
index d273fc6..bd49524 100644
--- a/README.md
+++ b/README.md
@@ -153,4 +153,4 @@
 Some additional metrics are also produced to give extra insights on their result about results and latency of healthcheck
 sub component, such as jgit, reviewdb, etc.
 
-More information can be found in the [config.md](resources/Documentation/config.md) file.
+More information can be found in the [metrics.md](resources/Documentation/metrics.md) file.

src/resources/Documentation/metrics.md

diff --git a/src/resources/Documentation/config.md b/src/resources/Documentation/metrics.md
similarity index 100%
rename from src/resources/Documentation/config.md
rename to src/resources/Documentation/metrics.md