Prep for v1.0 release

[odow]

Opening this as a placeholder. There are still a few steps:

• Finish consolidating logos and branding: Consolidating logos and branding #2920
• Decide what to do with the solver installation table: The plan for 1.0 #2564
• Merge the blog post: Blog post for JuMP 1.0 release jump-dev.github.io#71
• Create and push release-1.0
• Tag _J_u_liaRegistrator register (underscores to avoid accidentally triggering)
• Announce

[codecov]

Codecov Report

Merging #2925 (9913b59) into master (5e79e0b) will increase coverage by 0.06%.
The diff coverage is 66.66%.

@@            Coverage Diff             @@
##           master    #2925      +/-   ##
==========================================
+ Coverage   95.35%   95.41%   +0.06%     
==========================================
  Files          43       43              
  Lines        5791     5783       -8     
==========================================
- Hits         5522     5518       -4     
+ Misses        269      265       -4     

Impacted Files	Coverage Δ
src/JuMP.jl	95.58% <ø> (-0.04%)	⬇️
src/nlp.jl	94.59% <ø> (-0.06%)	⬇️
src/print.jl	98.53% <ø> (ø)
src/sd.jl	93.75% <ø> (+1.91%)	⬆️
src/operators.jl	96.13% <66.66%> (ø)
src/Containers/SparseAxisArray.jl	98.07% <0.00%> (+0.07%)	⬆️
src/_Derivatives/coloring.jl	94.70% <0.00%> (+0.62%)	⬆️

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