Fix update to 2.10.3 and add back deb/rpm for M5

Fixes few bugs with the recent release: 

- the main download page and the API page were still stuck on 2.10.2 ; moving to 2.10.3
- the deb and rpm links got lost between 2.11.0-M4 and M5 ; adding them back
- the last commit removes the "files/archives/" in the links on the API page, they are not needed.