Makes Examples Mobile-friendly

[justsml]

Dear ml5 community, 👋

I'm making a Pull Request(PR). Please see the details below.

→ Step 1: Which branch are you submitting to? 🌲

Release (for bug fixes)

→ Step 2: Describe your Pull Request 📝

Add missing viewport meta tag Minor fix to location of <script> tags in examples.

[justsml]

Thanks @joeyklee 🤘

Let me know if I need to make any changes.

[bomanimc]

Hey @justsml! We're archiving this repository and moving its contents into the core ml5-library repository (more context on issue #809 and pull request #831). We appreciate your contributions and would love it if you'd consider reopening this pull request on the ml5-library repo! Thanks!