I am sharing what I have already tried and what issues I still face. Let’s see if someone can help me or learn something rom what I did 
- Obsidian Vault on Windows synced with GDrive and GitHub
- I use a TiddlyWiki to generate html page whenever a file is pushed in GitHub Repo.
- That html goes on gh-pages branch -> which publishes it on the GitHub pages
- I use a GDive folder sync on my android phone to sync my vault in a folder which is then edited using Markor.
- I have a few apps installed for Markdown editing in my iPad but they don’t seem to create file in the Drive, though I can edit existing file and save them. (Weird iOS)
The current system lets me create a published view of my notes via TiddlyWiki. TiddlyWiki supports markdown, wikilinks ( [[ ]] ) and even the backlinks (linked and unlinked mentions --> very cool). The graph view can also be added to the wiki, but its kinda old and heavy, so I avoided it.
So, I can read my notes anywhere but can edit only via android app or iPad app. Tiddlywiki does support editing on the go but it doesn’t push to github as individual files but rather as a whole html. So can’t be used, alas.
The problems with the system are:
On Android or iPad, I cant really get the full advantage of backlinking, but I can still capture my notes. I wish there was something that allowed me to edit with linking. (GitJournal felt very crude and unusable to me).
I couldn’t find a good app on iPad to commit changes to Github. Or to clone a repo on iPad, else it would have been much easier.