Update documentation for Version 0.10

[stfnp]

User manual

• [ ] Document that files older than 0.7 are no longer supported
• [ ] Document changes to the inputs and outputs
• [ ] Input/Output formats: Documenting those is starting to get tiresome. Maybe refer to Rustdoc when ready.
• [ ] Add new section about limitations
• [ ] When explaining the new arrow mass definitions, add a conversion table for gpp to grams/Newton and grams/Joule for different draw lengths

Theory manual

• [ ] Document stress evaluation for the layers
• [ ] Document evaluation of stresses and strains for the new beam elements
• [ ] Include source for choice of corotational reference frame https://apps.dtic.mil/sti/tr/pdf/ADA358178.pdf
• [ ] Completely revise the theoretical documentation, remove old stuff
• [ ] Move verification examples into their own LaTex document
• [ ] Document new reference beams and remove old ones

Repository

• [ ] Document Rust build and test process, e.g. cargo test --release --features "plotters"
• [ ] Mention that CI treats warnings as errors, show clippy command
• [ ] Revise all Readme files, maybe add new ones to some of the folders
• [ ] Include a screenshot in the main Readme