Upgrade decidim to 0.28

[fblupi]

Fixes #36

[gitguardian]

⚠️ GitGuardian has uncovered 1 secret following the scan of your pull request.

Please consider investigating the findings and remediating the incidents. Failure to do so may lead to compromising the associated services or software components.

🔎 Detected hardcoded secret in your pull request

GitGuardian id	GitGuardian status	Secret	Commit	Filename
9774313	Triggered	Generic Password	5dfa8c0	.github/workflows/lint.yml	View secret

🛠 Guidelines to remediate hardcoded secrets

1. Understand the implications of revoking this secret by investigating where it is used in your code.
2. Replace and store your secret safely. Learn here the best practices.
3. Revoke and rotate this secret.
4. If possible, rewrite git history. Rewriting git history is not a trivial act. You might completely break other contributing developers' workflow and you risk accidentally deleting legitimate data.

To avoid such incidents in the future consider

• following these best practices for managing and storing secrets including API keys and other credentials
• install secret detection on pre-commit to catch secret before it leaves your machine and ease remediation.

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^{🦉 GitGuardian detects secrets in your source code to help developers and security teams secure the modern development process. You are seeing this because you or someone else with access to this repository has authorized GitGuardian to scan your pull request.}

[fblupi]

@HHassig you can continue working from here. Let's do the tasks below:

• Remove jQuery from JS files
• Lint JS files
• Adapt views and cells to the 0.28 styling
• Check everything is working as expected
• Include some system specs

[HHassig]

• Placeholder texts instead of "Note Takers" and "Participants (en.yml i18 error)
• Top note background color
• Edit chapter dropdown menu