Release Explorer 21.1.0 (Nuxeo 11.3)

New LTS-compliant version holding a few features, still using maintenance branch 21.0_11.3.

Features:

• NXP-30226 (stats)
• NXP-30208 (specific folder type + lifecycle) --> since newly-generated exports will use specific folder types and lifecycles, the target explorer instance for upload should also be updated accordingly ==> need to update production too, in a timely manner
• NXP-30206 (refine save filtering)
• NXP-30203 (handle component aliases)
• NXP-30169 (json api to get list of packages)
• NXP-30209 (javadoc link with release- hardcoded prefix)
• NXP-30466 (update logo after Hyland acquisition)