Clarify .env.template image-provider options

[cwenner]

Background

I tried using the stable-diffusion image provider based on the .env.template. It did not work with just the option specified under this subsection and settings had to be lifted from another provider. The literal for the SD image provider had to be found in the source code. This seemed straightforward to make more accessible.

Changes

• Move out the explanation for the two shared image-provider settings in .env.template so that they are not explained under a single provider's section.
• Add uncommentable lines with the specific IMAGE_PROVIDER values for each of provider options in .env.template, along with a standard IMAGE_SIZE.

Documentation

Improves documentation lines in .env.template. No other documentation required.

Test Plan

• With SD running, uncommented these options for SD webui in .env; ran the agent and it successfully used generate_image.

PR Quality Checklist

• [X] My pull request is atomic and focuses on a single change.
• [X] I have thoroughly tested my changes with multiple different prompts.
• [X] I have considered potential risks and mitigations for my changes.
• [X] I have documented my changes clearly and comprehensively.
• [X] I have not snuck in any "extra" small tweaks changes

No tests added as it improves the env template's commented-out lines, which did not have tests previously and are likely not intended to be tested.

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Name	Status	Preview	Comments	Updated (UTC)
docs	⬜️ Ignored (Inspect)			May 16, 2023 8:55am

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[Boostrix]

this seem to be stricly config only, and only adding/documenting options/comments - so should be pretty safe to consider as a candidate for pre-arch review.

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[codecov[bot]]

Codecov Report

Patch coverage: 16.66% and project coverage change: -0.09 :warning:

Comparison is base (85fe6f3) 62.26% compared to head (07152a4) 62.18%.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #3720      +/-   ##
==========================================
- Coverage   62.26%   62.18%   -0.09%     
==========================================
  Files          73       73              
  Lines        3339     3345       +6     
  Branches      482      484       +2     
==========================================
+ Hits         2079     2080       +1     
- Misses       1113     1118       +5     
  Partials      147      147              

Impacted Files	Coverage Δ
autogpt/main.py	0.00% <0.00%> (ø)
autogpt/utils.py	63.15% <33.33%> (-0.98%)	:arrow_down:

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