Prevent font flashing in the docs

[nilslindemann]

... by moving the Google font includes near the top of the head. By including them as early as possible, they are known, when the browser starts rendering the body.

Test it by making the change manually in doc/html/system.html and then press ctrl+f5 (reload without cache). This removes the font flashing.

Tested in Chrome and Firefox.

[Araq]

You need to update the tests too via nim c -r -d:nimTestsNimdocFixup nimdoc/tester.nim

[nilslindemann]

Thanks for the tip. I do not understand the seven failing checks, let me know if that's a problem.

[ire4ever1190]

Seems its the RST tests failing. Same steps except with rsttester.nim

nim c -r -d:nimTestsNimdocFixup nimdoc/rsttester.nim

[nilslindemann]

Execution of an external program failed

For the records, I get this error too locally, when I run nim c -r -d:nimTestsNimdocFixup nimdoc/tester.nim the first time:

C:\Nim\is_Repo\Nim>nim c -r -d:nimTestsNimdocFixup nimdoc/tester.nim

... (lots of lines) ...

11 failures occurred; see note in nimdoc/tester.nim regarding -d:nimTestsNimdocFixup
Error: execution of an external program failed: 'C:\Nim\is_Repo\Nim\nimdoc\tester.exe'

C:\Nim\is_Repo\Nim>

When I then run the same command again, it succeeds.

Let me know if you need precise steps to reproduce.

[ire4ever1190]

Don't worry thats fine. It updates the local files after running the tests.
Just commit the changes and it should be fine this time

[nilslindemann]

Don't worry thats fine. It updates the local files after running the tests. Just commit the changes and it should be fine this time

@ire4ever1190, but that's what I did. It is the second commit, the current state of this PR. After running the command nim c -r -d:nimTestsNimdocFixup nimdoc/tester.nim a second time. When I run this command again, GitHub Desktop shows no changes.

[ire4ever1190]

Ah, think you are running the same file twice rsttester.nim needs to be ran with -d:nimTestsNimdocFixup just like you did with tester.nim

[nilslindemann]

Seems its the RST tests failing. Same steps except with rsttester.nim

nim c -r -d:nimTestsNimdocFixup nimdoc/rsttester.nim

Ah, now I got you, you meant "NILS, DO the same steps ...". I have read it as "I DID the same steps ...". OK, my bad. So, I ran this command twice, and there was indeed another change. I just pushed it. Let's see if it works. Looks good.

[Araq]

Irrelevant CI failure, merging.

[github-actions]

Thanks for your hard work on this PR!
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