navbar links update

[hazemahmedx0]

The Docs link goes to docs.mdb.ai - it should go to docs.mindsdb.com
The Open Source -> GitHub link goes to docs.mindsdb.com - it should go to https://github.com/mindsdb/mindsdb
The Open Source -> Support link opens in the same tab (as opposed to other links in this category) - please make it open in a new tab

[martyna-mindsdb]

@hazemahmedx0
Thanks for the updates.
I listed the following changes to standardize both headers in the website and in the blog.

Overall, if the link goes outside of mindsdb.com we should open it in a new tab, but if it stays within mindsdb.com we should open it in the same tab.

In the blog header (updates to be made in this PR):

• Docs link should open in a new tab, since it goes outside of mindsdb.com
• Minds Cloud -> Minds Cloud link should open in a new tab, since it goes outside of mindsdb.com
• Open Source -> Integrations link should open in a new tab, since it goes outside of mindsdb.com
• Open Source -> GitHub link should open in a new tab, since it goes outside of mindsdb.com
• Connect with an Expert tab should be removed - and replace it with Enterprise tab from the website

On the mindsdb.com website header (updates to be made to the website):

• Open Source -> Community link should open in the same tab, since it doesn’t go outside of mindsdb.com