GitLab

* Updated preferences.rst

* Added into FAQ info about SPIFFS failed mount

* Updated troubleshooting

* Moved SPIFFS paragraph from FAQ to troubleshooting

* Minor updates

* Updated troubleshooting

* Updated SD README files and example comments

* Updated troubleshooting with SD issue

* Added note about S3 pins

* Updated SDMMC test setPins calls + added definition for default pins

* Updated SD_MMC comments

* Added pin table to SD_MMC readme

* Updated table in SD_SPI

* Updated based on comments

* Update io_mux.rst

* Update README.md