Remove old and outdated installation methods

Why is this change being made?

Some links in the install page do not point to the actual installation methods or some methods are outdated and haven't been updated by the community for a long time. We don't want users to have a bad experience, so remove them.

Before	After

For #6982 (closed)

Does this MR meet the acceptance criteria?

Assign to DRI

• Did you assign this change to the correct DRI of the page or information you are changing?

Conformity

• Added description to this MR explaining the reasons for the proposed change, per say-why-not-just-what