Improvements to package install and browsing

[nonprofittechy]

Fix #119
Fix #64

Adds a simple dashboard to let you view installed packages and the YAML files in them, and then run those packages. Makes it unnecessary to create a link to run the package.

Also adds the ability to add a private access token to the global configuration and to use a private access token when installing a package from GitHub using the Dashboard.

[gitguardian]

⚠️ GitGuardian has uncovered 3 secrets 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 secrets in your pull request

GitGuardian id	GitGuardian status	Secret	Commit	Filename
11053455	Triggered	Basic Auth String	2246e74	docassemble/ALDashboard/aldashboard.py	View secret
11053455	Triggered	Basic Auth String	800a1e4	docassemble/ALDashboard/aldashboard.py	View secret
11053470	Triggered	Basic Auth String	800a1e4	docassemble/ALDashboard/aldashboard.py	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 secrets safely. Learn here the best practices.
3. Revoke and rotate these secrets.
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.}

[nonprofittechy]

⚠️ 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
🛠 Guidelines to remediate hardcoded secrets
🦉 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.

Note that this is an example credential, not a real one. But I'll redact to help avoid future false positives.