docs: correct typos and improve help info

[Mikachu2333]

1. Correct typos By default rimage will place output images right in place of **precious** images, resulting in overwrite if input and output has the same format, could not understand the word "precious" and suspect that it should be "previous"
   (But still difficult to understand what the word "previous" mean, the input pic's dir or the folder for outputting images when using rimage last time?)
2. Change some sentences to become simpler to understand
3. Correct has the same format to has the same file extension name, e.g. pic with jxl or jpegxl file ext name has the same format and same codec.
4. Add some examples and recommand infos.
5. Change sh code mark to powershell for better color when display the commands

In progress

[Mikachu2333]

Do you think that the new section of "Detailed Examples" should be merged into the section "Basic optimization suitable for file transfer on web"? @SalOne22

Or is it necessary to merge all scattered examples into one large chapter?

[SalOne22]

Do you think that the new section of "Detailed Examples" should be merged into the section "Basic optimization suitable for file transfer on web"?

I think this should be a separate section.

Also take a look at the hyperfine repo for a great Usage section example.

[Mikachu2333]

Need to add infos about icc tags and new args about --preserve. Besides, maybe we need to add msgs about what rimage would do in each codecs when contains icc tag.