docs: add Netlify configuration for docs hosting migration

[harshitghagre]

What this PR does:

Why we need it:

Which issue(s) this PR fixes:

Fixes #6801

Does this PR introduce a user-facing change?:

• How are users affected by this change:
• Is this breaking change:
• How to migrate (if breaking change):

[Ayushmore1214]

@harshitghagre can we get some screenshots of this working ? I'm having some issue with it, I don't if its my env or the your code can you drop some outputs of this running, thanks!

[harshitghagre]

@harshitghagre can we get some screenshots of this working ? I'm having some issue with it, I don't if its my env or the your code can you drop some outputs of this running, thanks!

thanks for review @Ayushmore1214 , you can test on this url https://pipecd-docs.netlify.app/

[khanhtc1202]

Checked the testing link, it looks great. I left one comment on script update.
Also, why was the site on netlify doesn't contain the docs for v0.56.x?

[harshitghagre]

Checked the testing link, it looks great. I left one comment on script update. Also, why was the site on netlify doesn't contain the docs for v0.56.x?

It was misssing because the netlify build got timeout due to large page size, now i've increased build timeout. You can check on this url https://pipecd-docs.netlify.app/docs-v0.57.x/

[rahulshendre]

LGTM, @harshitghagre.
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