[Add] - runtime upgrade tutorial

[nhussein11]

This PR adds a tutorial for performing runtime upgrades as part of the zero to hero tutorials.

This is a follow up of #756, so please, let's merge that first

This PR is needed to solve #689.

[Copilot]

Pull Request Overview

Adds a new tutorial on performing runtime upgrades for Polkadot SDK-based chains, integrates it into the existing zero-to-hero series, and updates navigation and documentation indices.

• Introduces runtime-upgrade.md with step-by-step guidance to add a reset_counter dispatchable, bump runtime versions, submit via sudo/governance, and verify the upgrade.
• Updates the tutorial navigation (.pages) and LLMS index (llms.txt) to include the new “Runtime Upgrade” entry.
• Adds a termynal snippet (runtime-compilation.html) to show WASM build artifacts, plus minor line-reference updates in existing tutorials.

Reviewed Changes

Copilot reviewed 8 out of 19 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
tutorials/polkadot-sdk/parachains/zero-to-hero/runtime-upgrade.md	New tutorial on runtime upgrades
tutorials/polkadot-sdk/parachains/zero-to-hero/.pages	Adds “Runtime Upgrade” to navigation
tutorials/polkadot-sdk/parachains/zero-to-hero/llms.txt	Registers the new tutorial URL for LLMS
.snippets/code/.../runtime-upgrade/runtime-compilation.html	Adds terminal snippet for WASM build output
tutorials/polkadot-sdk/parachains/zero-to-hero/pallet-unit-testing.md	Updates code reference line numbers
tutorials/polkadot-sdk/parachains/zero-to-hero/pallet-benchmarking.md	Pins frame-omni-bencher to v0.10.0 and updates hl_lines
tutorials/polkadot-sdk/parachains/zero-to-hero/build-custom-pallet.md	Updates code reference line numbers
tutorials/polkadot-sdk/parachains/zero-to-hero/add-pallets-to-runtime.md	Adjusts code reference hl_lines and minor phrasing

Comments suppressed due to low confidence (4)

tutorials/polkadot-sdk/parachains/zero-to-hero/runtime-upgrade.md:79

• The comment refers to the “decrement action” but the test is checking an increment. Update it to reflect the increment action (e.g., “Ensure the event matches the increment action”).

        // Ensure the event matches the decrement action

tutorials/polkadot-sdk/parachains/zero-to-hero/runtime-upgrade.md:116

• [nitpick] This heading duplicates an earlier section title. Consider renaming it to something more specific (e.g., “Update Runtime Configuration”) to avoid confusion.

### Update the Runtime 

tutorials/polkadot-sdk/parachains/zero-to-hero/runtime-upgrade.md:179

• The list numbering jumps from 1 to 3, which may confuse readers. Change “3.” to “2.” to maintain proper sequence.

3. Click on the **Developer** and select the **Extrinsics** option in the dropdown

tutorials/polkadot-sdk/parachains/zero-to-hero/.pages:8

• [nitpick] The navigation list has an extra dash and inconsistent indentation here. Align this entry with the other list items for consistent YAML formatting.

  - 'Pallet Benchmarking': pallet-benchmarking.md

[brunopgalvao]

Pallet Benchmarking should point to Runtime Upgrade page in the Where to go Next section.

[github-actions]

🔍 Documentation URL Checker

This PR modifies documentation files in ways that could potentially create broken links.

Deleted files:

develop/smart-contracts/dev-environments/foundry.md

🚨 Please review these changes carefully 🚨

If not handled properly, broken links (404 errors) could appear. To maintain a smooth user experience, consider:

• Adding redirects in the mkdocs.yml file from the old URLs to the new ones
• Updating internal references to these files

[github-actions]

🔍 Documentation URL Checker

This PR modifies documentation files in ways that could potentially create broken links.

Deleted files:

develop/smart-contracts/dev-environments/foundry.md

🚨 Please review these changes carefully 🚨

If not handled properly, broken links (404 errors) could appear. To maintain a smooth user experience, consider:

• Adding redirects in the mkdocs.yml file from the old URLs to the new ones
• Updating internal references to these files

[nhussein11]

Pallet Benchmarking should point to Runtime Upgrade page in the Where to go Next section.
Nice catch! Thank you, fixed in 2ef117a

[dawnkelly09]

🔍 Documentation URL Checker

This PR modifies documentation files in ways that could potentially create broken links.

Deleted files:

develop/smart-contracts/dev-environments/foundry.md

🚨 Please review these changes carefully 🚨

If not handled properly, broken links (404 errors) could appear. To maintain a smooth user experience, consider:

• Adding redirects in the mkdocs.yml file from the old URLs to the new ones
• Updating internal references to these files

I checked for anything linking to the now removed Foundry page but didn't find anything I think this is ok.

[dawnkelly09]

🚀