feat: added basic html export of log files

[ErikBjare]

Relevant to https://github.com/ErikBjare/gptme/issues/23 and https://github.com/ErikBjare/gptme/issues/32

Has several issues:

• can't display the gptme/logmanager.py file (or the gptme/log2html.py file after my refactor), causes the entire message to be empty
• log should prob be included as raw json which is read with js and used to generate contents
  • has some downsides, but would prob work better. could even mean we can point a index.html at any log.json file, removing the need to build a html file per log

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Codecov Report

Attention: Patch coverage is 35.48387% with 20 lines in your changes missing coverage. Please review.

Project coverage is 80.16%. Comparing base (4900d19) to head (0d922d4).

:white_check_mark: All tests successful. No failed tests found.

Files with missing lines	Patch %	Lines
gptme/log2html.py	40.00%	12 Missing :warning:
gptme/commands.py	12.50%	7 Missing :warning:
gptme/logmanager.py	66.66%	1 Missing :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #105 +/- ## ========================================== - Coverage 80.69% 80.16% -0.54% ========================================== Files 45 46 +1 Lines 2787 2818 +31 ========================================== + Hits 2249 2259 +10 - Misses 538 559 +21 ``` | [Flag](https://app.codecov.io/gh/ErikBjare/gptme/pull/105/flags?src=pr&el=flags&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Erik+Bj%C3%A4reholt) | Coverage Δ | | |---|---|---| | [anthropic](https://app.codecov.io/gh/ErikBjare/gptme/pull/105/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Erik+Bj%C3%A4reholt) | `79.06% <35.48%> (-0.49%)` | :arrow_down: | | [openai](https://app.codecov.io/gh/ErikBjare/gptme/pull/105/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Erik+Bj%C3%A4reholt) | `78.38% <35.48%> (-0.52%)` | :arrow_down: | Flags with carried forward coverage won't be shown. [Click here](https://docs.codecov.io/docs/carryforward-flags?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Erik+Bj%C3%A4reholt#carryforward-flags-in-the-pull-request-comment) to find out more.

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