Remove upgrade note from the server upgrade page
Differentiate DB upgrade step between 4.4.x and 5.0.0-beta1 servers
Add section about JCM memory settings
Remove temporary server-migration-fs page
Add documentation for password provider changes to support salting

This commit modifies the sysadmin and developer documentation to document
the latest changes to the password provider including pasword salting support.
Fix the DB upgrade command for 5.0.0-beta1
Rewrite optimization lines to include quotes as tested in the job
Try to improve the sentence about reverting salting
Minor fixes to the server upgrade page
Fix dot in password provider page
Remove duplicated links from the sysadmin index page
Merge file annotation writing examples into annotation section

- Improve readability of the annotation writing subsection
- Merge Updating file annotation into Writing annotations
Improve description of getImages() by container signature
Homogeneize comments across the MATLAB documentation page
Minor fixes
Remove thumbnail methods from the MATLAB documentation page
Additional fixes suggested by @jburel
Exchange "Link" for user-friendlier "Mix data" cf. Gus's comment
update plugin options. See #11806
Merge remote-tracking branch 'origin/develop' into 11787_server_upgrade