revC3: change URL on back silkscreen to https

revC3: add URL to back silkscreen, resize VDAC labels on back silkscreen

revC3: add input filter for Vsense Without this filter, Vsense is sensitive to substantial aliasing on specific frequencies. Detailed measurements and reasoning in https://github.com/GlasgowEmbedded/glasgow/issues/221#issuecomment-753531753

revC3: increase spacing of the 3V3 flood fill on the internal power layer around the mounting holes For ensuring GND contact to a metal case one solution is to use serrated washers on the mounting holes. In some cases the serrated washers could penetrate through the outer PCB layer and create a short between 3V3 and GND. With the increased spacing this becomes very unlikely. None of the areas around the mounting holes is important for current flow or signal referencing.

revC3: change the I2C address of DAC A to remove the address clash with the SMBus Alert Response Request (ARA) - The SMBus Alert Response Request (ARA) is used by the INA233 - Add notes about this to the schematics - Also store the correct footprint of the reset IC U7 in the schematics (was previously just in the layout and the assignment in the schematics wrong)

revC3: fix internal i2c bus testpoint silkscreen labels on top side Fixes #250

revC3: remove port pinout marking on top silkscreen As decided in #256

revC3: change silkscreen to "owGglas revC?" to emphasise that it is a development version for now

CI: attempt to fix caching, attempt number 49. Can you tell I am angry about actions/cache yet.

manual: community: mention fediverse.