Fix rendering of non-markdown readme files

[odinuge]

Fix rendering of non-markdown readme files.

Issue: gogs/gogs/issues/3749

[odinuge]

Isn't readmeExist more or less the same as isMarkdown in the fileRender function?

readmeExist := isMarkdown || markdown.IsReadmeFile(blob.Name())
That means "readmeExist" is true when you are rendering a normal non-readme markdown file.

Or what do you think?

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[strk]

Inded those variable names are confusing.
readmeExist should be true even if the README is not in markdown format.

I've tested the fix and confirm it works. LGTM.

[metalmatze]

LGTM