BP reference update

[codingfrog27]

Feedback implemented!

For consideration

• for the optional disk image parameter i wrote

When specified, the pod's home filesystem will point to the /home directory within this image.

Is this correct? Or does the pod's home directory point to the root of the image instead?

changes

• added base bp handle reference page with general info
• same for terminal and process
  • referenced these 3 where applicable
• Documented Storagekey allowing for persitent storage
• mentioned onopen maps to xdg-open
• Tightened language throughout

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[GabrielaReyna]

Good job documenting these!

In addition to my comments on the code, I will add some bullet points as to-do's:

• Please document Terminal and Process, even if they are opaque or minimalistic. Please sync with Yuri and Alessandro for any questions. These are first-class, so they go at the same level as BinaryFile, TextFile etc.
• Please add links where Terminal and Process are mentioned in the text, referring to their documented page.
• There is a nice explanatory page for BinaryFile, this is a good chance to do something similar for BrowserPod in the reference, given an instance of BrowserPod we call it a "Pod" and it can be confusing for some users. This is an opportunity to link to this page when we call it like so.

[codingfrog27]

Addressed the latest review round, thanks for the review and feedback!

boot.md

• Corrected that userimages mounts to /home of the Pod's filesystem
• Clarified storage key

-createCustomTerminal: Dug into the code and found the type is ArrayBuffer, corrected it both here and in BP-meta

• Various other small fixes:
  • maybe noteworthy that I made the judgement call of wording Createfiles truncation to 0 bytes when called on existing files as "will wipe its contents".
• Extra: updated the new ephemeral mode setup in the Pod part of the glossary as well.