disable caching in lightly-serve

[japrescott]

closes lig-4625

• disables caching for lightly-serve. This mitigates issues where the browser gets a 404 from lightly-serve due to wrong setup/configuration and caches the result even though the lightly-serve got fixed.
• also added link to the docs and added some colors (see screenshot)

[codecov[bot]]

Codecov Report

Attention: 8 lines in your changes are missing coverage. Please review.

Comparison is base (51db826) 84.43% compared to head (84ecceb) 84.35%.

Files	Patch %	Lines
lightly/api/serve.py	0.00%	4 Missing :warning:
lightly/cli/serve_cli.py	0.00%	4 Missing :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #1507 +/- ## ========================================== - Coverage 84.43% 84.35% -0.09% ========================================== Files 140 140 Lines 5796 5802 +6 ========================================== Hits 4894 4894 - Misses 902 908 +6 ```

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