Document that pagers most and more are not used

[pgimalac]

As mentioned in #1063, pagers most and more are not used by bat for compatibility reasons, silently falling back to less (when set with PAGER environment variable), but this is not documented anywhere but the release description https://github.com/sharkdp/bat/releases/tag/v0.18.0.

I believe it should at least be explained why in the README.

[Enselic]

@pgimalac thanks for taking the time to report.

Is https://github.com/sharkdp/bat/blob/f366bbe34941f1c94851b4a91eef90b2dc3bc3ba/README.md#using-a-different-pager good enough from your perspective? If not, what would you change?

[pgimalac]

@Enselic thanks to you for taking the time to document this :)

I let you judge but perhaps referencing the issue which led to this choice (#1063) so people can easily find the details ? Otherwise I think it is good enough !

[Enselic]

Thanks for the feedback!

I do think however that the README.md would become too noisy if we would start adding references, so let's keep it as is. It is easy enough to dig deeper for those that want, using git grep, git blame, etc.

[pgimalac]

@Enselic that's exactly what I was worried about, and why I said that I let you judge.
Thanks for taking the time to document this.