docs: fix typos

Dependencies

• [2] TK4KSKUK Extend Setup Information
• [3] 6A5QEB4Q Write up some documentation on notifications
• [4] DOP3UP77 docs: note how to connect to the database
• [5] L4JYZ7BM doc: switch shell session code blocks to `console` type.
• [6] 5LVTBYXA README: fix manual links, fixes #401
• [7] CN2QKEK3 Add CI badge to README.md
• [8] OTJ3WFLG notifications: Document an example scenario where builds_finished is triggered twice.
• [9] KH55FNTF Update README
• [*] NVMDS7GE Add README.md
• [*] 3JXCTKEC Add markdown files for documentation

Change contents

• replacement in README.md at line 34
  [5.1435]→[5.1435:1690](∅→∅)
  − Afterwards you should be able to log by clicking on "_Sign In_" on the top right of the web interface using the credentials specified by `hydra-crate-user`. Once you are logged in you can click "_Admin -> Create Project_" to configure your first project.
  [5.1435]

  [2.0]
  + Afterwards you should be able to log by clicking on "_Sign In_" on the top right of the web interface using the credentials specified by `hydra-create-user`. Once you are logged in you can click "_Admin -> Create Project_" to configure your first project.
• replacement in README.md at line 37
  [2.42]→[2.42:335](∅→∅)
  − In order to evaluate and build anything you need to crate _projects_ that contain _jobsets_. Hydra supports imperative and declarative projects and many different configurations. The steps below will guide you through the required steps to creating a minimal imperative project configuration.
  [2.42]

  [2.335]
  + In order to evaluate and build anything you need to create _projects_ that contain _jobsets_. Hydra supports imperative and declarative projects and many different configurations. The steps below will guide you through the required steps to creating a minimal imperative project configuration.
• replacement in README.md at line 40
  [2.360]→[2.360:457](∅→∅)
  − Log in as adminstrator, click "_Admin_" and select "_Create project_". Fill the form as follows:
  [2.360]

  [2.457]
  + Log in as administrator, click "_Admin_" and select "_Create project_". Fill the form as follows:
• replacement in README.md at line 56
  [2.885]→[2.885:1023](∅→∅)
  − We have to add two inputs for this jobset. One for _nixpkgs_ and one for _hydra_ (which we are referrencing in the Nix expression above):
  [2.885]

  [2.1023]
  + We have to add two inputs for this jobset. One for _nixpkgs_ and one for _hydra_ (which we are referencing in the Nix expression above):
• replacement in doc/manual/src/hacking.md at line 77
  [4.71]→[4.71:147](∅→∅)
  − Assuming you're running the the default configuration with `foreman start`,
  [4.71]

  [4.147]
  + Assuming you're running the default configuration with `foreman start`,
• replacement in doc/manual/src/notifications.md at line 14
  [3.723]→[3.723:835](∅→∅)
  − * **When:** Issued directly before building happens, and only if the derivation's outputs cannot be subsituted.
  [3.723]

  [3.835]
  + * **When:** Issued directly before building happens, and only if the derivation's outputs cannot be substituted.