docs(contributing): Update installation steps to remove missing/unused commands

[programmer-ke]

Closes akash-network/support#359

There are some steps that are seemingly not needed any more when setting up the repository in dev.

• make cache does nothing, .cache directory is created on activating direnv
• make setup is missing
• .env file is tracked by default in the repo

Someone setting up the repo first time may therefore be confused by this.

This PR updates the CONTRIBUTING.md file to reflect the changes.

[coderabbitai]

Walkthrough

CONTRIBUTING.md updated to replace Make-based development setup with direnv steps, remove the .env copy instruction, add guidance to review and allow .envrc (which may trigger tooling/network activity), and adjust minor formatting including an EOF newline.

Changes

Cohort / File(s)	Summary of Changes
Docs: CONTRIBUTING CONTRIBUTING.md	Replace Make-based setup (remove make cache, make setup, and cp .env.example .env) with direnv workflow (direnv allow, direnv reload), add note to review ./.envrc and that activation may bootstrap tooling/network activity, minor formatting and EOF newline. No API changes.

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~3 minutes

Poem

A rabbit checks the env with care,
"Allow .envrc — I’ll be right there!"
Direnv hums, the workflow sings,
Fewer steps and lighter springs.
Carrot in paw, I hop to share. 🥕

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📥 Commits

Reviewing files that changed from the base of the PR and between f025f64 and d6f1230.

📒 Files selected for processing (1)

• CONTRIBUTING.md (2 hunks)

🚧 Files skipped from review as they are similar to previous changes (1)

• CONTRIBUTING.md

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[coderabbitai]

Actionable comments posted: 1

🧹 Nitpick comments (2)

CONTRIBUTING.md (2)

112-116: Optional: Add fish shell hook in the direnv setup section for completeness

Since you document hooks for bash and zsh, consider adding fish users’ hook to reduce setup friction.

You can add under “2. Add direnv hook to your shell:” (outside this hunk):

# For fish (add to ~/.config/fish/config.fish):
direnv hook fish | source

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218-218: Remove trailing whitespace at EOF

There’s a trailing space at the end of this line. It’s harmless in Markdown but unnecessary and can distract in diffs.

Apply:

-Thank you for contributing to the Akash Network Provider! 
+Thank you for contributing to the Akash Network Provider!

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📥 Commits

Reviewing files that changed from the base of the PR and between 97759f6 and f025f64.

📒 Files selected for processing (1)

• CONTRIBUTING.md (2 hunks)