Use https for links to user manual

[FreddieAkeroyd]

Description of work

Change links to https

Ticket

See ISISComputingGroup/IBEX#7229

Acceptance criteria

• links to help pages on user manual still work e.g. on kepco OPI and general ibex help link

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Code Review

• Is the code of an acceptable quality?
• If the change is to an OPI, does the check_opi_format.py script in C:\Instrument\Dev\ibex_gui\base\uk.ac.stfc.isis.ibex.opis pass?
• Do the changes function as described and is it robust?
• Is there associated PR for the release notes?

Final Steps

• Reviewer has also merged the release notes