FEAT: ignore certain languages in Timeline plot

[ferreroxc]

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I have a few repos that contain a lot of html code, but I don't want to include it in my code count. The code by quarter graph is very misleading, and I would like to focus on code that I contributed that are not html.

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Add a option similar to IGNORED_REPOS, like IGNORED_LANGUAGES, and we can input the languages that we do not want to count lines.

Describe alternatives you've considered
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I can add the repos that have a lot of html in IGNORED_REPOS, but there is still so valuable info that can be included in other graphs. Therefore it is only a workaround.

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