enhancements and fixes for Binary Input Channels Experiment

[two-ticks]

TODO:

1. Side Menu

• Replace "Binary Channels" in the side menu with "Simulation".

2. Aim

• Remove the "Aim" title from the page.

3. Theory

• Remove the "Theory" title from the page.
• Adjust the font styles for subtopics to match the design consistency of other pages.

4. Pretest

• Standardize all incorrect answers' explanations to start with "Incorrect Answer" (Q1e and Q3a)

5. Simulation

• Optimize the use of screen space for the experiment display.
  • Follow the VLabs 3-pane template.
• Make the simulation mobile-friendly.
• Add an "Instructions" section to guide users on interacting with the simulation.

6. Posttest

• Ensure all incorrect answers' explanations are consistent across the page.
  • Use "Incorrect Answer" as the standard phrase for all explanations.

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Follow-Up Notes

1. Side Menu

• Is it required to replace "Binary Channels" in the side menu with "Simulation" ?

2. Pretest

• Q1e seems fine to me

3. Simulation

• "Instructions" section is already present
• wrapping for BEC and BSC (avoid left right scrolling)
• adjust image size according to device

4. Posttest

• Options seem fine to me