doc: update documentation for `Context`

[tusharmath]

Add information about using

• Environment variables
• Variables

Briefly touch upon how mustache templates can be used to access context in directives.

[tusharmath]

/bounty 50$

[algora-pbc]

💎 $50 bounty created by tailcallhq
🙋 If you start working on this, comment /attempt #88 along with your implementation plan
👉 To claim this bounty, submit a pull request that includes the text /claim #88 somewhere in its body

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Attempt	Started (GMT+0)	Solution
🟢 @guptadeepak8		#128

[chaos-stotch]

Can I be assigned to this?

[tusharmath]

@chaos-stotch Go ahead please!

[xonx4l]

can I get assigned?? I have idea ready.

[algora-pbc]

💡 @guptadeepak8 submitted a pull request that claims the bounty. You can visit your bounty board to reward.

[algora-pbc]

🎉🎈 @guptadeepak8 has been awarded $50! 🎈🎊

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[wesleymatosdev]

this should be closed I guess @tusharmath