#10 potential improvements to the mtf hrt section

Hi, I apologize in advance about making multiple changes in little commits. 1. I added some new sections to the diy hrt section that I think would be suitable, I added new links/references 2. I tried to keep the original opinions (even if I disagree), though I did change some things, such as cypro dosage to 12.5 mg at most. Feel free to keep or discard any changes separately. 3. I moved things around a little so it's tidier Also, see line 305, as far as I know testing at trough every time, rather than peak is just plainly better. I'm not sure, do endocrinologists usually test at peaks? I didn't edit that because I am confused. My contributions in this pull request are hereby licensed under CC0.