I'm aware, it's just been extremely busy lately so I didn't have the time for it. I've been on it though, the guide will be ready in the near future.

Thanks a lot! Glad you liked it and glad to hear it helped you.

Thank you! I'm really glad the guide managed to help you the way it did and I want to say thank you in return for reading the guide and sticking with it, it really means a lot :)

Precision or Domination are both perfectly fine. In fact, I went with Domination on the guide for quite some time, but I eventually started playing Inspiration a lot because it gave you a bit more staying power as well as a safer game (important in this meta) than either Prec or Dom, both of which are only helpful in combat.
Eventually though, it mostly comes down to who you're up against. If the enemy laner is weak or prefers to afk-farm (Veigar for example), then you can greatly benefit from the combat enhancements Prec or Dom offer, control mid, and start helping out your team.

Thanks!

I don't think Inspiration is bad or anything (and I take it more often than not when the matchup requires sustain), I just prefer Domination, not because of the extra damage, but because of the insane amount of healing you get in the mid/late game. It's just a playstyle thing, I don't really think you can go wrong with either secondaries.

Oops, must have missed that. Thanks, nice catch :)

Hey, thanks for your feedback. If I understood what you did correctly, it isn't that much of a good move. Manaflow Band only stacks when attacking champions, and Tear has a cooldown of 3 stacks every 12 seconds. This means that you can't "gain" more than 18 mana every 12 seconds, so in order to stack it considerably at your base, you would need to stay out of lane for a long time and you'd lose a lot of XP and gold which wouldn't really give you any advantage. It's a good idea to use Q, W, R after recalling to base so you can get free stacks before going to your lane, but waiting for any more than that would really put you behind significantly.

You're right that biscuits would help with your early game mana issues. Taking inspiration as secondary is a very viable option in general because of Biscuits, Stopwatch, Ap. Velocity, Boots and Time-Warp Tonic, all of which are useful in certain situations (in fact it's especially viable now that the secondary tree doesn't dictate rune damage). However, I still prefer Domination because of the absurd amount of healing Ravenous Hunter gives you in the mid/late game, while Cheap Shot is a good early game steroid as well. In addition, Tear+Mana Crystal/Catalyst, the items you'll mostly be building early, give you enough mana to get by in lane while constantly harassing your opponent and if your jungler gives you a blue buff (which also happens more often than not if you ask for it) all the mana problems are gone.
Please note that my build is just a rough outline of what you'd want to build with Anivia, who other than her core, is a pretty versatile champion. If something else suits your playstyle best (ex. extremely aggressive), feel free to try it. Like I said in the beginning, Inspiration is as strong as Domination for different reasons, so you could try both and see which plays better for you; there is no wrong choice to make here.

Thank you. Anivia is one of the hardest champions to farm with in the early game, and there's no real way around it. In general though, a good way to make your CSing with Anivia easier is to take the Attack Speed bonus from your runes in order to make lasthitting a bit more fluid. Also, your E has a faster animation than your AA and deals some good damage, so don't hesitate to use it if you're about to miss a minion (especially after buying Tear, it gives you those extra stacks as well).
You could also try practicing lasthitting in general if you want, in practice mode. It might seem trivial at first, but it helps you build good lasthitting habits to give you that extra help.

Hey there. Thanks for the feedback :). I am not exactly sure when that happened, but I must have removed the runes section from the build accidentally. Thank you so much for noticing and I am REALLY sorry...

Now about those questions;
For Mana Band VS Nullifying Orb, it is up to your preference.

On the one hand, Mana Band is now very good for Anivia because it restores % missing mana after it's fully stacked, which is absolutely great when combined with Archangel's Staff. This is useful in EVERY game.

On the other hand, Nullifying Orb is also a great rune and it can save your life from very close situations, especially in the laning phase. It can be useful against any AP mid, but I suggest you only pick it when you are playing against an aggressive champion that you're not sure you can survive much against (for example, Fizz). If you are comfortable with every match up, then Nullifying Orb probably won't make much difference. It also depends on your playstyle. Do you fight 1v1 a lot in lane? Then it is very useful. Do you only farm and avoid skirmishes completely? Then it isn't as useful. Some champions Nullifying Orb soft-counters are burst mages like Lux and Veigar who rely on deleting you fast. It is also useful against Karthus's ulti early on, but you don't have a problem VS Karthus most of the time. Of course, you shouldn't pick it against AD mid laners like Talon or Yasuo.

Finally, Gathering Storm is really all about luck. You can never be sure if the game's gonna last longer than 25 minutes really. I prefer Gathering Storm because it slightly helps your mid/late-game, and that's where Anivia is really dangerous. Scorch is also good, but it is very weak after the Early game. Scorch is probably most useful against AD mid laners, because you can poke them for more damage and force them out of lane/kill them. You can pick it against anyone if you want more kill pressure tho!

I will make sure to add a small part in the runes section comparing the two in-depth. Be sure to check that out too :)