Clean up and fix issues with env configuration and .env.template

[erik-megarad]

Background

The configuration available is sometimes not documented, frequently doesn't make sense, has unused settings, amongst other issues.

The .env.template file is hard to read and as a new user it's really difficult to figure out what's going on.

Changes

• Clean up and standardize format of the .env.template file. Commented-out environment variables should always be set to the default value, and not an example value.
• Add a separate doc page for documentation of config variables that either did not exist or lived in the .env.template
• Rework configuration for image generation as it was messy and confusing.
• Set audio to text provider configuration to be the same as the other providers
• Rename CUSTOM_SEARCH_ENGINE_ID to GOOGLE_CUSTOM_SEARCH_ENGINE_ID
• Remove Twitter configuration from the .env template since it is no longer part of Auto-GPT core
• Rework configuration for text-to-speech so that the provider isn't magically divined from other settings

Documentation

It's all docs

Test Plan

Unit tests, setting values and running myself

PR Quality Checklist

• My pull request is atomic and focuses on a single change.
• I have thoroughly tested my changes with multiple different prompts.
• I have considered potential risks and mitigations for my changes.
• I have documented my changes clearly and comprehensively.
• I have not snuck in any "extra" small tweaks changes.
• I have run the following commands against my code to ensure it passes our linters:

  black .
  isort .
  mypy
  autoflake --remove-all-unused-imports --recursive --ignore-init-module-imports autogpt tests --in-place

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Name	Status	Preview	Comments	Updated (UTC)
docs	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Jun 9, 2023 10:24pm

[codecov]

Codecov Report

Patch coverage: 44.44% and project coverage change: -0.25 ⚠️

Comparison is base (3081f56) 69.81% compared to head (9534144) 69.56%.

❗ Current head 9534144 differs from pull request most recent head 9374623. Consider uploading reports for the commit 9374623 to get more accurate results

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #4630      +/-   ##
==========================================
- Coverage   69.81%   69.56%   -0.25%     
==========================================
  Files          72       72              
  Lines        3571     3568       -3     
  Branches      568      571       +3     
==========================================
- Hits         2493     2482      -11     
- Misses        890      896       +6     
- Partials      188      190       +2     

Impacted Files	Coverage Δ
autogpt/speech/eleven_labs.py	28.57% <0.00%> (ø)
autogpt/commands/audio_text.py	31.03% <11.11%> (-5.33%)	⬇️
autogpt/speech/say.py	36.66% <14.28%> (ø)
autogpt/config/config.py	71.52% <52.00%> (-3.14%)	⬇️
autogpt/commands/execute_code.py	70.11% <85.71%> (-3.42%)	⬇️
autogpt/commands/google_search.py	95.74% <100.00%> (ø)
autogpt/speech/stream_elements_speech.py	44.44% <100.00%> (ø)

... and 4 files with indirect coverage changes

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[github-actions]

This pull request has conflicts with the base branch, please resolve those so we can evaluate the pull request.

[github-actions]

Conflicts have been resolved! 🎉 A maintainer will review the pull request shortly.

[Auto-GPT-Bot]

You changed AutoGPT's behaviour. The cassettes have been updated and will be merged to the submodule when this Pull Request gets merged.