Follow-up from "Draft: Improving instructions for using C270 optics options"

As we merge !311 (merged) the manual microscope uses the C270 as the standard camera. Some C270 issues remain before v7 can be released.

• We need to decide on the default stand used: either the simple post stand (compact and quick to print) as here, or the no_pi stand (more stable) in !424 (merged).
• A c270 lens spacer that supports and protects the board better (See !419 (merged)).
• Stop using "*Some text" as a way to draw attention to the need to disassemble the C270 in the RMS section of the alternative optics page.

We also need to decide if #385 is critical for v7.