docs: delete unused blogs.md and discord.md and update references to upstream (#2113)

Signed-off-by: tannaya7 <tannayasupriya157@gmail.com>

Author: tannaya7

CONTRIBUTING.md

@@ -89,7 +89,7 @@ We welcome blog posts! Whether you're sharing a tutorial, case study, or your ex
 - Blog posts are submitted to the [Hiero Website Repository](https://github.com/hiero-ledger/hiero-website) in a Pull Request
 - Written in Markdown
 
-**Full guide with step-by-step instructions:** [Blog Post Guide](docs/blogs.md)
+**Full guide with step-by-step instructions:** [Blog Post Guide](https://github.com/hiero-ledger/sdk-collaboration-hub/blob/main/guides/issue-progression/for-developers/blogs.md)
 
 ---
 
@@ -159,7 +159,7 @@ git rebase main -S
 
 Thank you for contributing to the Hiero Python SDK! 🎉
 
-- **Need help or want to connect?** Join our community on Discord! See the **[Discord Joining Guide](docs/discord.md)** for detailed steps on how to join the LFDT server
+- **Need help or want to connect?** Join our community on Discord! See the **[Discord Joining Guide](https://github.com/hiero-ledger/sdk-collaboration-hub/blob/main/guides/issue-progression/for-developers/discord.md)** for detailed steps on how to join the LFDT server
 - **Quick Links:**
     - Join the main [Linux Foundation Decentralized Trust (LFDT) Discord Server](https://discord.gg/hyperledger).
     - Go directly to the [#hiero-python-sdk channel](https://discord.com/channels/905194001349627914/1336494517544681563)

docs/blogs.md

@@ -178,4 +178,4 @@ transaction.set_account_id(new_id)  # Error: Transaction is immutable
 - **Auto-freeze/sign:** Works for simple transactions but can hide issues in complex ones.
 - **Order dependency:** Construct → Freeze → Sign → Execute → Receipt.
 
-For more details, refer to the SDK documentation or community calls on [Discord](https://github.com/hiero-ledger/hiero-sdk-python/blob/main/docs/discord.md).
+For more details, refer to the SDK documentation or community calls on [Discord](https://github.com/hiero-ledger/sdk-collaboration-hub/blob/main/guides/issue-progression/for-developers/discord.md).

docs/discord.md

@@ -60,7 +60,7 @@ We have several workflows that check:
 - All Examples Pass
 
 If they are failing and you require help, you can:
-- Contact us on [Discord](../../../discord.md)
+- Contact us on [Discord](https://github.com/hiero-ledger/sdk-collaboration-hub/blob/main/guides/issue-progression/for-developers/discord.md)
 - Attend the Python SDK Office Hours using the [LFDT Calendar](https://zoom-lfx.platform.linuxfoundation.org/meeting/99912667426?password=5b584a0e-1ed7-49d3-b2fc-dc5ddc888338)
 - Ask for help on the pull request
 

docs/sdk_developers/training/transaction_lifecycle.md

@@ -297,7 +297,7 @@ We have several security and quality checks.
 Please review and check they all pass.
 
 If they are failing and you require help, you can:
-- Contact us on [discord](../discord.md)
+- Contact us on [Discord](https://github.com/hiero-ledger/sdk-collaboration-hub/blob/main/guides/issue-progression/for-developers/discord.md)
 - Attend [Python SDK Office Hours](https://zoom-lfx.platform.linuxfoundation.org/meeting/99912667426?password=5b584a0e-1ed7-49d3-b2fc-dc5ddc888338)
 - Attend [Community Calls](https://zoom-lfx.platform.linuxfoundation.org/meeting/92041330205?password=2f345bee-0c14-4dd5-9883-06fbc9c60581)
 - Ask for help on the pull request