docs: fix broken markdown links and add lychee config

[tannaya7]

Description:
Fixed broken markdown links detected by the scheduled link checker. Changes include:

• Fixed truncated Discord channel ID in docs/discord.md by removing the invalid deep link
• Fixed diff markers (merge artifacts) in docs/sdk_developers/training/network_and_client.md
• Created .lychee.toml configuration file to exclude intentional placeholder URLs from link checking
• Updated .github/workflows/cron-check-broken-links.yml to reference the new config file

Related issue(s):

Fixes #2050

Notes for reviewer:

• rebasing.md fix was not needed as the file no longer exists in the repo
• Discord channel deep link was removed as the correct 18-19 digit snowflake ID could not be verified
• Placeholder URLs are now excluded via .lychee.toml instead of being modified

Checklist

• Documented (Code comments, README, etc.)
• Tested (unit, integration, etc.)

[codacy-production]

Up to standards ✅

🟢 Issues 0 issues

Results:
0 new issues

View in Codacy

_{TIP This summary will be updated as you push new changes. Give us feedback}

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Walkthrough

This pull request corrects a malformed heading in documentation and configures Lychee for link checking. The documentation fix addresses an incorrectly nested heading marker, while the new Lychee configuration defines URL exclusion patterns and request parameters to reduce false positives from known broken links.

Changes

Cohort / File(s)	Summary
Documentation Heading Fix docs/sdk_developers/training/network_and_client.md	Corrected malformed nested heading marker in "Example: Complete Setup" section by replacing ## -### Example: Complete Setup with proper ### Example: Complete Setup formatting.
Lychee Link Checker Configuration pyproject.toml	Added [tool.lychee] configuration block defining URL exclusions (GitHub patterns, Hedera testnet, localhost, assets) and request/retry parameters (timeout=20s, retry_wait=2s, max_retries=3).

Estimated code review effort

🎯 2 (Simple) | ⏱️ ~8 minutes

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title clearly summarizes the main changes: fixing broken markdown links and adding lychee configuration for link checking.
Description check	✅ Passed	The description is directly related to the changeset, detailing specific fixes for broken links and the addition of lychee configuration.
Linked Issues check	✅ Passed	The PR addresses issue #2050 by fixing broken markdown links and adding lychee configuration to exclude intentional placeholders from checks.
Out of Scope Changes check	✅ Passed	Changes are limited to documentation fixes and link-checker configuration as specified in issue #2050; no unrelated modifications detected.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.

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View plan for ticket: #2050

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🧪 Generate unit tests (beta)

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[coderabbitai]

Actionable comments posted: 2

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Path: .coderabbit.yaml

Review profile: ASSERTIVE

Plan: Pro

Run ID: 32f11e8c-1756-4847-b983-52c841b39f44

📥 Commits

Reviewing files that changed from the base of the PR and between 817986c and 80b55a9.

📒 Files selected for processing (4)

• .github/workflows/cron-check-broken-links.yml
• .lychee.toml
• docs/discord.md
• docs/sdk_developers/training/network_and_client.md

[coderabbitai]

Actionable comments posted: 1

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Path: .coderabbit.yaml

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Run ID: 3fbfd3c4-418f-433d-9631-e3518a19b2a2

📥 Commits

Reviewing files that changed from the base of the PR and between 1ab77d6 and 602bd88.

📒 Files selected for processing (1)

• pyproject.toml

[manishdait]

@tannaya7, the pre-commit checks are failing you can add the pre-commit by following the docs below
Setup Docs

[exploreriii]

@manishdait could you help to create a good first isssue to expand the set up in the templates to enable the pre commits?

[manishdait]

@manishdait could you help to create a good first isssue to expand the set up in the templates to enable the pre commits?

Yes

[manishdait]

@tannaya7, one of your commit is missing the signoff you can fix it by running

git rebase -i HEAD~2
git commit --amend --no-edit -s -S

[exploreriii]

@tannaya7 this is good but cannot merge due to your signing

note one commit is not GPG key signed

you need all of them to be DCO+GPG key signed

i recommend
git reset --soft HEAD~14

recommit
git commit -S -s -m "chore: your message"

git push --force

Please follow the guide in the issue carefully.

[exploreriii]

Thanks!

[manishdait]

seems good to me