fix: re-organize the description of supported architectures

[farshidtz]

PR #744 added the description of supported architectures. The text has some overlapping information with the platform requirement page. I've moved the information to the platforms requirements page and linked to it. Also fixed another hyperlink to that page.

Other resolved issues:

• It claimed that ZMQ doesn't compile on arm32, which isn't accurate. Compiling ZMQ for arm32 is possible; cross-compiling it is difficult.
• A blanket statement that artifacts are released only for amd64 and arm64 is limiting. In some cases, we may want to release some services for other architectures. For example, the device-gpio snap is built also for armhf to allow installation on a wider range of devices.

Related to #702

Signed-off-by: Farshid Tavakolizadeh [email protected]

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[lenny-goodell]

LGTM