Document 'tmt_plan' and 'tf_post_install_script'

[csomh]

Was introduced in packit/packit#1619.

[TomasTomecek]

ah, I just realized Rodolfo already resolved this in #489

pity he didn't link the docs PR with the p-s PR

[csomh]

Shouldn't we document everything on https://packit.dev/docs/configuration/, too? In order to have a single page where everything can be found in a single place.

[TomasTomecek]

oh, I missed it's in the testing-farm document and not the configuration; agreed!

[TomasTomecek]

There are only links in configuration.md pointing to testing-farm. Do we want to keep this trend or actually have a single page with all the configuration values?

[csomh]

I'm not sure, but so far I found it handy to be able to open the configuration page and look up any configuration option.

As a user I would expect something like this, or if there are more options, then maybe multiple pages, but then it should be clear which page covers what. Right now I don't think it's self-explanatory that the "Testing Farm" page also documents configuration, or that the Configuration page doesn't document options related to Testing Farm.

[TomasTomecek]

+1 I also grep mostly when looking for a config option

[lachmanfrantisek]

Related to #467

[csomh]

Closing. #467 should fix this.