docs: Add 10.3 sha256 sums, news item and link release notes

Signed-off-by: Emil Velikov <emil.l.velikov@gmail.com>
(cherry picked from commit 18571edea8f444fc6b4ed2b38f945f0ac533f384)

Conflicts:
	docs/index.html
	docs/relnotes.html
diff --git a/docs/relnotes.html b/docs/relnotes.html
index 36bcd13..0a4c3de 100644
--- a/docs/relnotes.html
+++ b/docs/relnotes.html
@@ -21,6 +21,8 @@
 </p>
 
 <ul>
+<li><a href="relnotes/10.3.html">10.3 release notes</a>
+<li><a href="relnotes/10.2.8.html">10.2.8 release notes</a>
 <li><a href="relnotes/10.2.7.html">10.2.7 release notes</a>
 <li><a href="relnotes/10.2.6.html">10.2.6 release notes</a>
 <li><a href="relnotes/10.2.5.html">10.2.5 release notes</a>