chore(docs): update .env.example

[mudler]

Description

This pull request includes a small change to the .env.example file. The change modifies the Twitter configuration to use TWITTER_ACCOUNTS instead of TWITTER_USERNAME (old). So it is consistent with docs as well: https://developers.masa.ai/docs/masa-protocol/protocol-twitter-scraper-config

• .env.example: Changed TWITTER_USERNAME to TWITTER_ACCOUNTS to better reflect that multiple accounts can be configured.

Notes for Reviewers

Signed commits

• [ ] Yes, I signed my commits.

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 9.94%. Comparing base (038fad6) to head (6a59e17). Report is 1 commits behind head on main.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #603 +/- ## ======================================== + Coverage 9.80% 9.94% +0.13% ======================================== Files 99 99 Lines 5892 5892 ======================================== + Hits 578 586 +8 + Misses 5241 5233 -8 Partials 73 73 ```

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