Grammar Fix in Linaria Documentation

[donatik27]

1. File: docs/src/content/ignition/docs/guides/upgradeable-proxies.md
   Old text: "This file will look a little different than the others"
   New text: "This file will look a little different from the others"
   Reason: Using "different from" is grammatically correct when comparing two things, while "different than" is incorrect in formal technical documentation.

2. File: docs/README.md
   Old text: "with works fine with SSG sites"
   New text: "which works fine with SSG sites"
   Reason: The word "which" is the correct relative pronoun to connect the clauses and describe the functionality of Linaria's CSS generation. Using "with" was grammatically incorrect and made the sentence unclear.

Old text: "Landing pages contains"
New text: "Landing pages contain"
Reason: Fixed subject-verb agreement since "pages" is plural, the verb should be "contain" not "contains" to maintain proper grammar.

3. File: docs/src/content/hardhat-runner/docs/config/index.md
   Old text: "where your contract are stored"
   New text: "where your contracts are stored"
   Reason: The word needs to be plural since it refers to multiple smart contracts in the documentation context.

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